On the following graph, use the green point (triangle symbol) to plot the annual total revenue when the market price is $30, $45, $60, $75, $90, $105, and $120 per bippitybop.
According to the midpoint method, the price elasticity of demand between points A and B is approximately ________ .
Suppose the price of bippitybops is currently $120 per bippitybop, shown as point A on the initial graph. Because the price elasticity of demand between points A and B is __________ , a $15-per-bippitybop decrease in price will lead to_____________ in total revenue per day.
In general, in order for a price increase to cause a decrease in total revenue, demand must be__________ .