Mean variance analysis is a component of modern portfolio theory, which assumes investors make rational decisions, and that for increased risk they expect a higher return. Next Up.
sitâ²-in`. 1. an organized passive protest against racial segregation in which the demonstrators occupy seats prohibited to them in public places. 2. any organized protest in which the demonstrators occupy and refuse to leave a public place.
Definition of sitâdown. 1  1 : a cessation of work by employees while maintaining continuous occupation of their place of employment as a protest and means toward forcing compliance with demands. 2  2 : a mass obstruction of an activity by sitting down to demonstrate a grievance or to get the activity modified or halted.