and mostly the restaurant are usual way is to buy anyway because there are material in Chiang Rai is not much to choose. Them can save cost at most lowest prices but the same ingredients and they will not to fix cost, because them already know about material in Chang Rai will be purchased at the price now, but them would emphasize that the shop will sell to customers in the amount to be worth the price to sell, because some of the raw material price increases, it can save for lose money such as pork prices increases, but them will not focus on reducing the amount of food down them choose to the average