Dee is an accomplished actress and a homeowner who pays a landscaper to maintain her lawn rather than do it herself. dee has determined that she can earn more in the hour it would take her to work on her lawn than she must pay her landscaper. this scenario is an example of which principle of economics? a. governments can sometimes improve market outcomes. b. markets are usually a good way to organize economic activity. c. trade can make everyone better off. d. prices rise when the government prints too much money.

c. Trade can make everyone better off

Explanation:

Trade between is not like a sports competition where one side wins and the other loses. In fact, the opposite is true: trade can be good for both parties, this is one of the principles of the economy. Commerce allows people to specialize in the activity they are best at, be it agriculture, sewing or construction. By trading with others, people can buy a greater variety of goods and services at a lower cost.

In the case set out in the question above, when Dee chose a landscaper to work for her, she showed that commerce can benefit everyone. That's because by hiring the landscaper, Dee has free time to use another activity she finds necessary, and by hiring the expert, Dee knows that the work done will be better than if she did it herself. When hired, the landscaper receives a salary that will be used for his livelihood and leisure. That way everyone benefits.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.