Question

read the excerpt from levitt and dubners freakonomics. driving around the parks that encircle washington, he solicited customers with a simple pitch: early in the morning, he would deliver some bagels and a cash basket to companys snack room; he would return before lunch to pick up the money and the leftovers. it was an honor - system commerce scheme, and it worked. within a few years, feldman was delivering 8,400 bagels a week to 140 companies and earning as much as he had ever made as a research analyst. he had thrown off the shackles of cubicle life and made himself happy. the authors prove feldmans success by describing the honor - system scheme his daily routine his work as an analyst the size of his business

Explanation:

The authors mention delivering 8,400 bagels to 140 companies, showing business - size growth as proof of success.

Answer:

the size of his business