But our time of rapid change seems to be peculiarly the age of problems.

The movement of the world has been more rapid in the last century than ever before--in population, in natural science, in invention, in the changes of political and economic institutions; in intellectual, religious, moral, and social opinions and beliefs.
Some human problems are for the individual to solve, as, whether it is better to go to school or to go to work, to choose this occupation or that, to emigrate or to stay at home.

Other problems of wider bearing concern the whole family group; others, still wider, concern the local community, the state, or the nation.

In each of these there are more or less mingled economic, political and ethical aspects.

Economics in the broad sense includes the problems of individual economy, of domestic economy, of corporate economy, and of national economy.