Law of unintended consequences

One day, years ago I wanted to wash cars for money and was a very good idea, i received 15 soles for each wash. First i started with my car and then people of my street saw me and wanted their cars to be washed. What i wanted was only to clean my car and get 15 soles each week. But consequences got mad, there was a car wash business down the street and they washed for 17 soles and they got less and less clients that made them broke. I didn t wanted to make them broke i just wanted to clean my car but opportunity to make more money came and i did not reject it. It was a consequence i unintended.