I might get knocked on the head by HN for saying this, but .... my MBA. Wait, wait, before you hit me, let me explain. My undergrad major was in CS and I did a

I might get knocked on the head by HN for saying this, but .... my MBA. Wait, wait, before you hit me, let me explain. My undergrad major was in CS and I did a minor in economics, but I never took marketing classes, I never took a class in organizational behaviour, in pricing theory, accounting etc. I was exposed to a lot of this during my MBA program and it has helped me immensely in the startups I've done since finishing my MBA. I find that people who have always been entrenched in technical fields have a hard time stepping back and it seeing issues through the eyes of the "average" person - for some definition of average. But a close second in terms of investment, a second monitor. For programming, having two screens is essential I find. I'd say my productivity increased by 20% (e.g. being able to iteratively prototype more readily, leading to quicker turnaround)