Choice is necessary because resources are scarce. This means that there are not enough resources available to satisfy all the wants and needs of people. As a result, people have to make choices about how to allocate the resources they have in order to best meet their needs and wants. These choices involve trade-offs, where the decision to use a resource for one purpose means that it cannot be used for another purpose. Therefore, choice is necessary in order to make the best use of the limited resources available.