A little bit of Erica, by my side. A little bit of Rita's, all I need. A little bit of Tina, is what I seek. A little bit of Sandra, in the sun. Diversification is good .
Downward adjustments have a bigger impact than upward adjustments.
Black's leverage effect . What's goes up, must come down. Stock returns are mean reverting . There is something happening here. The stochastic process of stock returns .