Production doesn't always increase as quickly or easily as economics 101 would have you believe. When there is a severe drought, there can be talk about towing icebergs but somehow it doesn't happen. Instead, people cut back on water usage.

You need to look into how production is actually done in each market to understand how quickly producers can respond to changes in demand.

(I'm not going to worry about beef, though, since there are good substitutes.)