How do labor$-$saving technologies differ from labor$-$complementary technologies?

A$.$ Labor$-$saving technologies substitute for existing labor inputs, while labor$-$complementary technologies augment existing labor inputs.

B$.$ Labor$-$saving technologies result in lower wages and less employment, while labor$-$complementary technologies result in higher wages and more employment.

C$.$ Labor$-$saving technologies decrease the marginal product of labor, while labor$-$complementary technologies increase the marginal product of labor.

D$.$ All of the above.

For simplicity, consider a monopolist with no costs whatsoever; thus profit is revenue, which is just price multiplied by quantity. Demand consists of two gre are $14$ adults: $10$ are willing to pay $$30$ and $4$ are willing to pay $$20.$ There are also $16$ children: $6$ are willing to pay $$20$ and $10$ are willing to pay $$10.$

The best single $($uniform$)$ price to charge is $$20.$

Suppose the monopolist could price discriminate by setting a different price for each group.

The monopolist's best price to charge adults is $$,$ and his best price to charge children is $

For simplicity, consider a monopolist with no costs whatsoever; thus profit is revenue, which is just price multiplied by quantity. Demand consists of two gre are $14$ adults: $10$ are willing to pay $$30$ and $4$ are willing to pay $$20.$ There are also $16$ children: $6$ are willing to pay $$20$ and $10$ are willing to pay $$10.$

The best single $($uniform$)$ price to charge is $$20.$

Suppose the monopolist could price discriminate by setting a different price for each group.

The monopolist's best price to charge adults is $$,$ and his best price to charge children is $