Investors are wondering if the consumer can afford to buy more expensive salads.The restaurant sector took a bit of a hit this week with shares of Sweetgreen (SG -1.23%) taking the brunt of the move on news that consumers are cutting back in a lot of areas. Cava Group, another high-growth chain, also fell this week but Sweetgreen's move hit double digits.According to data provided by S&P Global Market Intelligence, shares of Sweetgreen had dropped 17.4% this week as of 1 p.m. ET on Friday and there may not ...