[zanny]

In economics needs aren't actual physical human needs. The homeless need shelter and the starving need sustenance, but they have none because they don't create economic demand for it because they have no money.

People would only build the homeless man a house or sell the starving mother a fish if they had something to give in return, at least in the naive purely free market economic sense, but that is how macroeconomic observations on supply and demand operate - irrespective of choices made outside of economic rationality.