Interest rates set the exchange rate between future cashflows (i.e. assets) and cash today. Lower interest rates mean higher asset values, higher interest rates mean lower asset values. Higher asset values generally disproportionately benefit those that own assets (wealthy people) over those that don't (average people).

Of course, this is just one way that interest rates affect the economy, and it's important to bear in mind that lower interest rates can also stimulate investment which help to create jobs for average people as well.