Difficult to figure out in the real world but a cinch on the Internet because where you have communication you have feedback. The more lines of communication the greater the feedback. It shouldn't take an age to find out what people need and then arrange to produce it. Easy-peasy on the Internet. Transactions are the result of communications.
Communications can be fast, cheap and plentiful.
So can transactions. This now becomes just a matter of simple algebra. Income is a number of transactions times a profit. Jump up the number of transactions and the amount of profit you need for a given income can reduce dramatically. The law of diminishing returns swngs into reverse and comes out in your favour.