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.
Market structures. Market structure is defined by economists as the characteristics of the market. It can be organizational characteristics or competitive characteristics or any other features that can best describe a goods and services market.The major characteristics that economist have focused on in describing the market structures are the nature of competition and the mode of pricing in that market.he level of competition in firms will be influenced by the market structure. A competitive market structure and a monopoly will have different levels of competition. Features of market structure. 1  The number of firm operating in a market; It will cover both the local and foreign markets.