Two stores, A and B are competitors. I visit company A and say that I'll stand at the entrance of their competitor, store B. I'll tell each customer trying to enter store B about store A and attempt to refer them, as long as store A pays me $0.50 for each person I try to send their way.
This works, some people that drove to visit store B now go to store A instead. Now, store B is getting annoyed at me "stealing" their customers, but I have a solution. I tell store B the more money they pay me, the less likely it is that I'll refer their next customer to store A. So, store B starts paying me $1.00 each time someone tries to enter their own store, and in return, I do nothing but stand there.
A year goes by and I'm standing at the entrance of every store in the country. I collect a dollar when someone tries to enter every store, and I do nothing but let them pass.