The argument about why people are poor has been running, in recognisably the same form, since before sociology existed.

On one side: poverty is produced by the characteristics of poor people — their choices, habits, family arrangements, or the culture they have developed. On the other: poverty is produced by the arrangements they live under — wages, jobs, housing, discrimination, the design of the benefit system.

It is usually posed as an either-or and it is not one. But some parts of it have been settled by evidence, and knowing which parts is worth more than a position.

The recurring structure of the argument

The three families of explanation

What the four kinds of evidence show