The Lophophore. the Phoronida. The lophophore can most easily be described as a ring of tentacles, but it is often horseshoe-shaped or coiled. Phoronids have their lophophores in plain view, as shown above, but brachiopods like the one below must be opened wide in order to get a good view of their lophophore.
Definition. The effect of aggregate supply and demand in a market environment on the prices of goods and services. Market forces will cause prices to increase when supply decreases or demand increases, whereas prices will fall when demand decreases or supply increases.
For conventional economics the market by way of the operation of supply and demand answer these questions. Under conditions of competition, where no one has the power to influence or set price, the market (everyone, producers and consumers together) determines the price of a product, and the price determines what is produced, and who can afford to consume it.