DEFINITION of 'Substitution Effect'. The idea that as prices rise (or incomes decrease) consumers will replace more expensive items with less costly alternatives.
Dysmenorrhea, also known as dysmenorrhoea, painful periods, or menstrual cramps, is pain during menstruation. It usually begins around the time that menstruation begins. Symptoms typically last less than three days. The pain is usually in the pelvis or lower abdomen.Other symptoms may include back pain, diarrhea, or nausea. In young women painful periods often occur without an underlying problem.t usually begins around the time that menstruation begins. Symptoms typically last less than three days. The pain is usually in the pelvis or lower abdomen. Other symptoms may include back pain, diarrhea, or nausea. In young women painful periods often occur without an underlying problem.
The process by which menorrhea occurs is called menstruation. Normal vaginal bleeding occurs as a result of cyclic hormonal changes. The ovaries are the main source of female hormones, which control the development of female body characteristics such as the breasts, body shape, and body hair.