Worse is better

A concept recently brought to my attention about when the curve of value over resources flattens, basically. It was originally used in software development but can easily be extended to organisational resource allocation (both time and money), as well, and it's a similar concept with the Agile 'just enough' theory and 'less is more' design approach. 

Come to think of it, examples can be found all around us - from the iPhone's limited number of external buttons (i.e. emphasising simplicity) to the tipping points we expect before taking (more) radical decisions (i.e. career or personal wise). More info on the original concept here.