If there is a floor on wages created by a minimum wage, union contracts, or other factors, then a decline in the marginal productivity of low-skilled workers will the demand for low-skilled workers and the number of unemployed workers.

Decrease; Increase

Explanation:

When there is a decline in the marginal productivity of low skilled workers, it results in a decline or decrease in the demand for low skilled workers. Marginal productivity is the extra output gained from adding one unit of labour. Thus, if low skilled workers are added to increase marginal productivity, but then reaches the point of decline, the demand or the need for those low skilled workers reduces. The reduction or decrease in the demand for these low skilled workers then lead to an increase in number of unemployed workers as those unskilled workers becomes jobless.

the correct answer is economics is a game without winners or losers.

unlike sports or games economic is a game without losers or winner rather it is a game where everyone wins. parties of business doing businesses exchange money with each other and hence exchange is done on the basis of goods. one party takes the goods and other sales it so there is winner on both sides. each party values more highly the good it gets than the good it gives up. both sides exchange only because both intend to increase their value. so there is no concept of lose or win.