The choice of color here is not obvious to me. For example, greener could mean more money, i.e. more expensive. Also red connotes debt/negative in accounting, w

The choice of color here is not obvious to me. For example, greener could mean more money, i.e. more expensive. Also red connotes debt/negative in accounting, while black is surplus/positive. If you're eating a tomato, red is good and green is bad (unless fried I guess).