Jack goes to market

A family trade game. Jack goes to the market with three cows. Trade them as best as you can, and when the market is closed, see how much you've made of them.
The goal of the game is to trade your three cows before the market closed. You can trade them for chickens, pigs or beans...
Each player takes his turn by trading one of his good with one good on any merchant stands.
When a merchant has the three of the same item in his stand, he closes it. When all the stands are closed, the game ends.
You gain three points for every cow, two points for every pig, one point for every chicken, no points for the bean, unless you have three of them, then you score 10 points. They are the magical beans of the Jack and the Beanstalk story.