it has nothing to do with how many people walk in the door of one of your three businesses with cash to buy. But, you know that.
The problem you have is pretty basic for most people
First of all, I'm trying to stay on point and not provide a tangent that has no relevancy to Keynesian economics.
Next, your assumption in the area of business relationships though have some point to them, but something like red tape can give a business quite a disadvantage when the playing field is different with your competitors and your fight for the consumers legal tender. This can range from being in one city, one county, one state, or one country from another. In the restaurant business, fines or the need to bring things up to code can be detrimental even if you hire the best waiter around unless you've already earmarked capital for these kinds of things which many do not....and we're not even touching upon the added mark up just so you can stay within an existing monthly budget (rent, utilities, phones, advertising, employees, etc.)
Anyway, I am just quoting from Keynes' book from the mid 30's. If anyone has a beef with the structure of his theory, best to take it up with him...whoops, he's dead.