Actual experience shows that on the average the price of wheat and other nonperishable crops remains the same all year round except for an allowance for storage, interest and insurance charges.
This fighting hypothesis, where an imbalance in the population results in an advantage for left-handed fighters or athletes, is an example of negative frequency-dependent selection.
If you were to weigh up the average amount of times that you actively choose not to get in your car, I would say it's in the, you know, the 99% time you choose the more sustainable route.