The demand for orthodontist services falls as the proportion of the population that obtain braces falls, it may takes several years before the new long run equilibrium for the orthodontist market is attained. in the meantime, the orthodontist labor market experiences a

b.letter b

explanation:

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.

answer; thin-slice judgments;