An investor bought a share of a stock at the beginning of 2015. At the beginning of 2017, the share was worth $1050. From the beginning of 2015 to the beginning of 2017 the value of the share halved each year, but from the beginning of 2017 to the beginning of 2019, the value of the share increased by 1.5 times each year. The investor sold the share at the beginning of 2019. Find and interpret the difference between what the investor paid for the share and what the investor sold the share for.