Select all the items that describe incentives.
can be positive or negative
can be monetary or non-monetary
can change
affect people's choices and behavior
this is economics

Incentive is any effort made in order to influence someone to do a certain thing.

So, i believe the answer is:

can be positive or negative

(The influence could be created by using either reward or punishment)

can be monetary or non-monetary

(Monetary incentives refers to the incentives in the form of bonus money or other financial benefit while non-monetary refers to the incentives in the form of special treatment)

can change

(Incentives can be changed freely depending on the creator's situation)

affect people's choices and behavior

(People tend to more inclined to make sacrifice if there is incentive on the line in exchange of their hard work)

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

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explanation:

ahw