To fully explain how EMCs work we need to introduce another couple of artifacts that are not specific to Haier but that are essential in the pruning of this basic model: the dual system of Order and Bids. An order and a bid can be seen as the two sides of a contract:
-the **order** specifies what kind of contribution a certain party is supposed to provide as part of an agreement;
-the **bid** specifies the conditions that the proponent is ready to meet to fulfill the order (for example the quality or quantity of the contribution – e.g.: producing 100k pieces in one month) and the related conditions expected in return (e.g.: a fixed lump sum, a % of profits generated by the outcome on the market).