A group of consumers walking through a public market to purchase vegetables with the background of the busy store just behind them.
Shoppers purchasing vegetables at a busy public market.
Sentence 2 of shoppers choosing to purchase vegetables at a market is a shortened version of sentence 1; consumers is another word for shoppers.
A group of consumers  is inferred as  Shoppers.
Shoppers are consumers and they walk through a busy vegetable market.