Which factor is NOT considered a component affecting Supply?

The factor that is not considered a component affecting Supply in the context of real estate or mass appraisal is tax policies. While tax policies can influence demand by affecting individuals' purchasing power and investment decisions, they do not directly impact the supply side of the market.

Supply is generally influenced by factors that affect the actual availability and production of properties, such as building costs (which include materials and labor necessary to construct or renovate properties), interest rates (which affect financing costs and home affordability, thus influencing construction activity), and broader economic conditions (which can dictate how many properties are being developed or are feasible to develop based on economic growth or contraction).

In contrast, tax policies typically address issues of ownership and investment incentives rather than the physical creation of new housing stock or the existing inventory of properties in the market. Therefore, tax policies play a more indirect role in the overall market dynamics, making them less relevant when considering the supply component.