The economy is not just the work of one person -- even the president. It is an evolving entity, if you will, and in any given period, it show the results of years & years of tweaking.
It's kind of like mixing paint by hand; you add different colors and it changes, sometimes more than you wanted and sometimes less. So you have to keep working at it to get it just right. And what's just right to you is not acceptable to someone else. So it has to be modified to accomodate everyone's desires -- which is not possible, so there has to be compromise. And once everyone finally agrees, and implements the plan, the needs change because life changes. Then there are more modifications and more compromises and it just never ends.