This would really be relative to what kinds of shops, and the layout of the street parking (if any) after the bike lane is put in place. You're assuming that bi

This would really be relative to what kinds of shops, and the layout of the street parking (if any) after the bike lane is put in place. You're assuming that bike traffic is sufficient to make up for car traffic. But if it's a market, a bicyclist or pedestrian might only buy one bag worth of goods, while someone driving up with a car might be there to buy three. Similarly, you're assuming there's increased foot traffic; but the foot traffic doesn't increase just because parking is replaced with a bike lane, so that's basically static.