The reason for all market economies to have taxes to support armed forces, police forces, public schools, and at least some form of public transportation.

a. socialist propaganda has convinced other countries that market economies really do not work well.

b. public services are very profitable.

c. businesses always encourage more government services and the wealthy are never opposed to high taxes.

d. all countries have discovered that profits will motivate firms to solve most, but never all, of their economic needs.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.