Multiple studies demonstrate that customers who arrive by car come less often and spend less in total than customers who arrive by any other means. Why? Because it costs the customer a fortune to drive and park their car, so they are spending more on transportation and less on whatever you are selling. The same studies have demonstrated that business owners do not know this. This is why the small business parking delusion persists. This is why small business owners show up at city council meetings across the country to argue against their own best interest.

Here's one and you can google for the rest: http://kellyjclifton.com/Research/EconImpactsofBicycling/TRN...