We frequently confuse internal biochemistry (caused by habits and genetics) with external events. If we didn't, marketing wouldn't work nearly as well.

Our brains are busy processing chemicals that internally change our moods, but find a way to rationalize those mood changes based on events and purchases in the outside world. We often act as though money can buy joy, but of course, it works better when we're joyful in the first place.

We don't say, "I'm genetically pre-disposed to mild depression,