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.
Sit ups are an effective exercise to strengthen and tone your abdominal muscles, but the stress they put on your muscles and digestive system can cause pain. Severe pain can indicate issues including cramps, a strained muscle, and problems with your stomach and intestines.revention. Take steps before and after sit ups to prevent severe pain. Warm up before doing sit ups, and gently stretch your muscles after your warm up and after the sit ups.