Despite billions spent over 15 years, Amazon's grocery strategy is unprofitable and incoherent; research: Amazon and Whole Foods had 2.4% US share in December (Annie Palmer/CNBC)

Annie Palmer / CNBC:Despite billions spent over 15 years, Amazon's grocery strategy is unprofitable and incoherent; research: Amazon and Whole Foods had 2.4% US share in December  —  - Amazon's grocery endeavors have cost many billions of dollars over the past 15 years but have yet to yield a coherent strategy.

Despite billions spent over 15 years, Amazon's grocery strategy is unprofitable and incoherent; research: Amazon and Whole Foods had 2.4% US share in December (Annie Palmer/CNBC)

Annie Palmer / CNBC:
Despite billions spent over 15 years, Amazon's grocery strategy is unprofitable and incoherent; research: Amazon and Whole Foods had 2.4% US share in December  —  - Amazon's grocery endeavors have cost many billions of dollars over the past 15 years but have yet to yield a coherent strategy.