MOUNT PROSPECT, IL - MAY 04:  Shoppers stand near the fruits and vegetables section at the...
MOUNT PROSPECT, IL - MAY 04: Shoppers stand near the fruits and vegetables section at the Costco store May 4, 2006 in Mount Prospect, Illinois. Retail spending in April was reportedly the highest in two years as Costco itself reported same-store sales up by about seven percent. (Photo by Tim Boyle/Getty Images)(Getty Images)
CHICAGO - AUGUST 19:  A Costco worker loads a shopping cart near a casket sample display in a...
CHICAGO - AUGUST 19: A Costco worker loads a shopping cart near a casket sample display in a Costco store August 19, 2004 in Chicago. Costco, the world's largest warehouse club, has begun a test program offering caskets at two of its Chicago stores. (Photo by Tim Boyle/Getty Images)(Getty Images)
LANHAM, MD - JANUARY 29:  U.S. President Barack Obama (C) is escorted by Costco employees Ray...
LANHAM, MD - JANUARY 29: U.S. President Barack Obama (C) is escorted by Costco employees Ray Quevedo (L) and Rickey Banner while touring the store before speaking January 29, 2014 in in Lanham, Maryland. Obama is beginning a two-day, four-state tour to promote policies outlined in his State of the Union speech and including raising the minimum wage. (Photo by Mike Theiler-Pool/Getty Images)(Getty Images)
NILES, IL - MARCH 8, 2002:  (FILE PHOTO)  Sales associate Don Ebert (R) checks a shopper's...
NILES, IL - MARCH 8, 2002: (FILE PHOTO) Sales associate Don Ebert (R) checks a shopper's purchase March 8, 2002 at a Costco Wholesale store in Niles, Illinois. Warehouse retailer Costco Wholesale Corp. has reported higher quarterly profits as the promise of bulk goods at bargain prices resonated with consumers in the U.S. recession. Warehouse retailers charge customers an annual membership fee, typically $35 to $45, to shop at clubs that offer deep discounts on bulk quantities of items like food and household cleaners. Costco, the largest U.S. warehouse club operator, reported May 28, 2003 an 18 percent jump on higher sales in the third quarter, causing its stock to go up seven percent. (Photo by Tim Boyle/Getty Images)(Getty Images)
402065 08: A shopper displays her Costco Wholesale membership card as she enters a Costco...
402065 08: A shopper displays her Costco Wholesale membership card as she enters a Costco Wholesale store March 8, 2002 in Niles, IL. Warehouse retailer Costco Wholesale Corp. has reported higher quarterly profits as the promise of bulk goods at bargain prices resonated with consumers in the U.S. recession. Warehouse retailers charge customers an annual membership fee, typically $35 to $45, to shop at clubs that offer deep discounts on bulk quantities of items like food and household cleaners. (Photo by Tim Boyle/Getty Images)(Getty Images)
NEW YORK - NOVEMBER 13:  People shop inside of a recently opened Costco warehouse store on...
NEW YORK - NOVEMBER 13: People shop inside of a recently opened Costco warehouse store on November 13, 2009 in New York City. The store, the first in Manhattan, opened in a former wire factory in East Harlem on the East River. Costco Wholesale Corp., the largest U.S. warehouse club, anticipates that the warehouse store will be its highest-volume store within three years. Currently Costco has three other stores within New York City limits in Brooklyn, Queens and Staten Island. (Photo by Spencer Platt/Getty Images)(Getty Images)
NEW YORK - NOVEMBER 13:  Shoppers enter a recently opened Costco warehouse store on November...
NEW YORK - NOVEMBER 13: Shoppers enter a recently opened Costco warehouse store on November 13, 2009 in New York City. The store, the first in Manhattan, opened in a former wire factory in East Harlem on the East River. Costco Wholesale Corp., the largest U.S. warehouse club, anticipates that the warehouse store will be its highest-volume store within three years. Currently Costco has three other stores within New York City limits in Brooklyn, Queens and Staten Island. (Photo by Spencer Platt/Getty Images)(Getty Images)
402065 01: Chicago resident Sharon Szafoni and her 5-year-old son Mathew shop in the bulk-foods...
402065 01: Chicago resident Sharon Szafoni and her 5-year-old son Mathew shop in the bulk-foods aisle with a large grocery cart March 8, 2002 in a Costco Wholesale store in Niles, IL. Warehouse retailer Costco Wholesale Corp. has reported higher quarterly profits as the promise of bulk goods at bargain prices resonated with consumers in the U.S. recession. Warehouse retailers charge customers an annual membership fee, typically $35 to $45, to shop at clubs that offer deep discounts on bulk quantities of items like food and household cleaners. (Photo by Tim Boyle/Getty Images)(Getty Images)
CHICAGO - MAY 26:   Shoppers leave the Costco Store May 26, 2005 in Chicago, Illinois. Costco...
CHICAGO - MAY 26: Shoppers leave the Costco Store May 26, 2005 in Chicago, Illinois. Costco reported today an increase of six percent in third quarter profits over the same period last year. (Photo by Scott Olson/Getty Images)(Getty Images)
MOUNT PROSPECT, IL - MAY 31:  A worker pushes carts outside a Costco Wholesale store May 31,...
MOUNT PROSPECT, IL - MAY 31: A worker pushes carts outside a Costco Wholesale store May 31, 2006 in Mount Prospect, Illinois. Third-quarter earnings reported today were up at Costco, the nation's largest warehouse club operator, although current oil prices affected margins at their associated gas stations. (Photo by Tim Boyle/Getty Images)(Getty Images)
RICHMOND, CA - MARCH 06:  A sign is posted on the outside of a Costco store on March 6, 2014 in...
RICHMOND, CA - MARCH 06: A sign is posted on the outside of a Costco store on March 6, 2014 in Richmond, California. Costco Wholesale reported a 15 percent drop in secnd quarter earnings with profits of $463 million, or $1.05 per share, compared to $547 million, or $1.24 per share, one year ago. (Photo by Justin Sullivan/Getty Images)(Getty Images)
LOS ANGELES, CA - MARCH 12:  Customers shop at Costco on March 12, 2013 in Los Angeles,...
LOS ANGELES, CA - MARCH 12: Customers shop at Costco on March 12, 2013 in Los Angeles, California. Costco Wholesale Corp.'s profit beat expectations with a net income for the second quarter that climbed to almost 40 percent. (Photo by Kevork Djansezian/Getty Images)(Getty Images)
RICHMOND, CA - MARCH 06:  A sign is posted on the outside of a Costco store on March 6, 2014 in...
RICHMOND, CA - MARCH 06: A sign is posted on the outside of a Costco store on March 6, 2014 in Richmond, California. Costco Wholesale reported a 15 percent drop in secnd quarter earnings with profits of $463 million, or $1.05 per share, compared to $547 million, or $1.24 per share, one year ago. (Photo by Justin Sullivan/Getty Images)(Getty Images)
RICHMOND, CA - MARCH 06:  A customer packs groceries into his car outside of a Costco store on...
RICHMOND, CA - MARCH 06: A customer packs groceries into his car outside of a Costco store on March 6, 2014 in Richmond, California. Costco Wholesale reported a 15 percent drop in secnd quarter earnings with profits of $463 million, or $1.05 per share, compared to $547 million, or $1.24 per share, one year ago. (Photo by Justin Sullivan/Getty Images)(Getty Images)
MOUNT PROSPECT, IL - MAY 31:  A motorist pumps gasoline into her sport utility vehicle at a...
MOUNT PROSPECT, IL - MAY 31: A motorist pumps gasoline into her sport utility vehicle at a Costco Wholesale store's gas station May 31, 2006 in Mount Prospect, Illinois. Third-quarter earnings reported today were up at Costco, the nation's largest warehouse club operator, although current oil prices affected margins at their associated gas stations. (Photo by Tim Boyle/Getty Images)(Getty Images)
NILES, IL - JUNE 16:  Shoppers enter and leave a Costco store June 16, 2005 in Niles, Illinois....
NILES, IL - JUNE 16: Shoppers enter and leave a Costco store June 16, 2005 in Niles, Illinois. The larger "big box" stores such as Costco, Target's SuperTarget and Wal-Mart's Supercenter stores are offering premium beef and poultry items, competing against other supermarkets and the smaller independent grocers and butcher shops. (Photo by Tim Boyle/Getty Images)(Getty Images)
NORTH MIAMI - MARCH 13:  Michael Kaire (2nd L) and Sylvia Kaire  (C) and others shop at a...
NORTH MIAMI - MARCH 13: Michael Kaire (2nd L) and Sylvia Kaire (C) and others shop at a Costco store March 13, 2008 in North Miami, Florida.The Commerce Department released a report today that shows retail sales fell by 0.6 percent last month. Costco has shown strong quarterly results as most of the U.S. market flounders. (Photo by Joe Raedle/Getty Images)(Getty Images)
RICHMOND, CA - MARCH 02:  Costco customers walk in front of a Costco Warehouse store March, 2,...
RICHMOND, CA - MARCH 02: Costco customers walk in front of a Costco Warehouse store March, 2, 2006 in Richmond, California. Costco Wholesale Corporation, the nation's largest warehouse club operator, reported an 11 percent increase in quarterly sales, beating second quarter estimates. (Photo by Justin Sullivan/Getty Images)(Getty Images)
402065 10: A Costco Wholesale sign is visible over an entrance to a Costco Wholesale store...
402065 10: A Costco Wholesale sign is visible over an entrance to a Costco Wholesale store March 8, 2002 in Niles, IL. Warehouse retailer Costco Wholesale Corp. has reported higher quarterly profits as the promise of bulk goods at bargain prices resonated with consumers in the U.S. recession. Warehouse retailers charge customers an annual membership fee, typically $35 to $45, to shop at clubs that offer deep discounts on bulk quantities of items like food and household cleaners. (Photo by Tim Boyle/Getty Images)(Getty Images)
CHICAGO - MAY 26:  Shoppers enter the Costco Store May 26, 2005 in Chicago, Illinois. Costco...
CHICAGO - MAY 26: Shoppers enter the Costco Store May 26, 2005 in Chicago, Illinois. Costco reported today an increase of six percent in third quarter profits over the same period last year. (Photo by Scott Olson/Getty Images)(Getty Images)
NEW YORK - NOVEMBER 25:  A Costco store is seen November 25, 2008 in the Brooklyn borough of...
NEW YORK - NOVEMBER 25: A Costco store is seen November 25, 2008 in the Brooklyn borough of New York City. Consumer spending was down in the third quarter of 2008, as Americans tightened their belts in response to the worst financial crisis in a generation. (Photo by Chris Hondros/Getty Images)(Getty Images)
RICHMOND, CA - MARCH 06:  A customer leaves a Costco store on March 6, 2014 in Richmond,...
RICHMOND, CA - MARCH 06: A customer leaves a Costco store on March 6, 2014 in Richmond, California. Costco Wholesale reported a 15 percent drop in secnd quarter earnings with profits of $463 million, or $1.05 per share, compared to $547 million, or $1.24 per share, one year ago. (Photo by Justin Sullivan/Getty Images)(Getty Images)
RICHMOND, CA - JULY 13:  A Costco customer pushes her shopping cart by a display of televisions...
RICHMOND, CA - JULY 13: A Costco customer pushes her shopping cart by a display of televisions at a Costco warehouse store July 13, 2007 in Richmond, California. Costco Wholesale Corporation reported a six percent jump for June same store sales fueled by a spike in sales of televisions, jewelry, computers and groceries. (Photo by Justin Sullivan/Getty Images)(Getty Images)
NEW YORK - NOVEMBER 13:  Shopping carriages are lined-up outside of a recently opened Costco...
NEW YORK - NOVEMBER 13: Shopping carriages are lined-up outside of a recently opened Costco warehouse store on November 13, 2009 in New York City. The store, the first in Manhattan, opened in a former wire factory in East Harlem on the East River. Costco Wholesale Corp., the largest U.S. warehouse club, anticipates that the warehouse store will be its highest-volume store within three years. Currently Costco has three other stores within New York City limits in Brooklyn, Queens and Staten Island. (Photo by Spencer Platt/Getty Images)(Getty Images)
NILES, IL - MARCH 8, 2002:  (FILE PHOTO)  A Costco Wholesale sign is visible over an entrance...
NILES, IL - MARCH 8, 2002: (FILE PHOTO) A Costco Wholesale sign is visible over an entrance to a Costco Wholesale store March 8, 2002 in Niles, Illinois. Warehouse retailer Costco Wholesale Corp. has reported higher quarterly profits as the promise of bulk goods at bargain prices resonated with consumers in the U.S. recession. Warehouse retailers charge customers an annual membership fee, typically $35 to $45, to shop at clubs that offer deep discounts on bulk quantities of items like food and household cleaners. Costco, the largest U.S. warehouse club operator, reported May 28, 2003 an 18 percent jump on higher sales in the third quarter, causing its stock to go up seven percent. (Photo by Tim Boyle/Getty Images)(Getty Images)
NORTH MIAMI - MARCH 13: Nataly Gold (L), Sivan Gold and Anna Rodriguez (R) and others shop at a...
NORTH MIAMI - MARCH 13: Nataly Gold (L), Sivan Gold and Anna Rodriguez (R) and others shop at a Costco store March 13, 2008 in North Miami, Florida.The Commerce Department released a report today that shows retail sales fell by 0.6 percent last month. Costco has shown strong quarterly results as most of the U.S. market flounders. (Photo by Joe Raedle/Getty Images)(Getty Images)
MOUNT PROSPECT, IL - MAY 04:  Leah Cannon looks at books as she shops at the Costco store May...
MOUNT PROSPECT, IL - MAY 04: Leah Cannon looks at books as she shops at the Costco store May 4, 2006 in Mount Prospect, Illinois. Retail spending in April was reportedly the highest in two years as Costco itself reported same-store sales up by about seven percent. (Photo by Tim Boyle/Getty Images)(Getty Images)
NORTH MIAMI - MARCH 13:  Nataly Gold (L), Sivan Gold,(C) and Anna Rodriguez (R) shop at a...
NORTH MIAMI - MARCH 13: Nataly Gold (L), Sivan Gold,(C) and Anna Rodriguez (R) shop at a Costco store March 13, 2008 in North Miami, Florida.The Commerce Department released a report today that shows retail sales fell by 0.6 percent last month. Costco has shown strong quarterly results as most of the U.S. market flounders. (Photo by Joe Raedle/Getty Images)(Getty Images)
RICHMOND, CA - JULY 13:  A customer shops for groceries at a Costco warehouse store July 13,...
RICHMOND, CA - JULY 13: A customer shops for groceries at a Costco warehouse store July 13, 2007 in Richmond, California. Costco Wholesale Corporation reported a six percent jump for June same store sales fueled by a spike in sales of televisions, jewelry, computers and groceries. (Photo by Justin Sullivan/Getty Images)(Getty Images)
LOS ANGELES, CA - MARCH 12:  Customers shop at Costco on March 12, 2013 in Los Angeles,...
LOS ANGELES, CA - MARCH 12: Customers shop at Costco on March 12, 2013 in Los Angeles, California. Costco Wholesale Corp.'s profit beat expectations with a net income for the second quarter that climbed to almost 40 percent. (Photo by Kevork Djansezian/Getty Images)(Getty Images)
LOS ANGELES, CA - MARCH 12:  Customers shop at Costco on March 12, 2013 in Los Angeles,...
LOS ANGELES, CA - MARCH 12: Customers shop at Costco on March 12, 2013 in Los Angeles, California. Costco Wholesale Corp.'s profit beat expectations with a net income for the second quarter that climbed to almost 40 percent. (Photo by Kevork Djansezian/Getty Images)(Getty Images)