Human beings need to eat. That's true. Human beings make other human beings. It's instinctive. Or "instinctual." It's something to do as our planet spins around the Sun, and so-on.
Human beings try to make things easier for themselves. But they also try to create things that make existence seem better.
And the work that we do to stay alive and to avoid unnecessary suffering, and to do something worthwhile, ... that's the economy.
Two things seem crucial: Growing enough food to support everyone, and controlling our population so that this continues to be feasible.
How we decide to do this, ... how we grow food, distribute it, purchase it, earn it, ... how we do that and everything else, is "political economy."
Where am I going with this? Nowhere. I'm too busy.
Here's a link to an article.