Maybe, but the effect, even if unintended, might not be in the best interests of all parties involved. For example, I'm pretty sure you wouldn't like it if I said how much I can pay for food per 100 bushels.
I'm a member of the Dwilight trade guilds, and I already know that Garret is the one that set the food price for the island at 50, by offering to buy at that price. You single-handedly increased the price Gornak can buy food at, from 25 to 50. D'Hara can probably afford that price--assuming that the supply is there--but I should probably think about starting some rumors about the army that Garrett is trying to feed.