If the demand for labor increases when worker productivity rises, then the demand for a product produced by those workers would increase as the price of that product rises. Thus, A:B :: C:?

When worker productivity rises, it means that workers can produce more goods in the same amount of time. This increase in productivity often leads to a higher demand for labor because employers want to hire more workers to take advantage of the increased output. As the demand for labor goes up, the products those workers create also become more desirable, especially if the prices of those products rise. For example, if a factory can produce more toys quickly and efficiently, the demand for those toys will increase as more people want to buy them, even at higher prices. Therefore, if we think of A as labor and B as the product, then C would represent the rising demand for that product as productivity increases, making the relationship A:B :: C: demand for products.