In 2013, Fresh & Easy filed for Chapter 11 bankruptcy protection.

The chain was acquired by grocery billionaire Ron Burkle's Yucaipa Cos.

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Big-box retailers such as Wal-Mart and Target were expanding their food offerings, while niche rivals like Trader Joe's were opening new locations.

Shoppers were also increasingly turning to farmers markets to get their produce.

In March, the chain said it was closing 50 stores and rolling out new store formats.

Ideas included even smaller convenience stores and an e-commerce service that allows customers to buy groceries online and have food waiting curbside at the store.

Sales figures do not necessarily indicate how a firm is performing relative to its competitors.

Rather, changes in sales simply may reflect changes in the market size or changes in economic conditions.

The firm's performance relative to competitors can be measured by the proportion of the market that the firm is able to capture.

This proportion is referred to as the firm's market share and is calculated as follows: Market Share = Firm's Sales / Total Market Sales Sales may be determined on a value basis (sales price multiplied by volume) or on a unit basis (number of units shipped or number of customers served).

Even online giants like and Google have been rolling out grocery delivery.