[syrrim]

Is this assuming all streets are one-way? If they are, than I wouldn't expect an economic impact on businesses. Since the amount of products people buy - and the money they are willing to spend - should stay the same, than the total money influx would remain constant. Therefore, the only change would be how this money is distributed. Since all stores would lie on one-way streets, none would be more impacted than the other.

[malyk]

It's definitely about the specific businesses that are on the one way street. And I might recall (been awhile since I read the book), that he specifically used the example of changing from two way to one way and that the result is businesses on the affected street lost revenue.

It makes intuitive sense. When a street is two way cars pass by both directions each day increasing the likelihood of stopping at a store on that street. When streets are one way, then stores only get people driving by once a day, and so they lose revenue.