Final answer:
In the third-party exchange marketplace model, a b) 'vertical' market concentrates on a specific industry.
Step-by-step explanation:
In the third-party exchange marketplace model, a vertical market concentrates on a specific industry or market. The term 'vertical' signifies a focus on a particular industry or group of companies with similar business needs. This contrasts with a horizontal market, which targets a broad range of industries with services or products that have wide application.
A price ceiling does not directly shift either the demand curve or the supply curve. Instead, it is a legal limit on the price of a commodity in the market, intended to prevent prices from rising above a certain level. However, the imposition of a price ceiling can lead to shortages, as the price may be held below the equilibrium price, where supply equals demand. Mainly, this mechanism affects the quantity supplied and the quantity demanded rather than shifting the curves themselves.
A software developer typically works in the tertiary sector or, more specifically, the quaternary sector of an economy. The tertiary sector involves service industries, while the quaternary sector encompasses information services and knowledge-based areas, which align with the tasks and responsibilities of a software developer.