4. In Los Angeles, the demand for Botox injections (a procedure that removes wrinkles and smoothes the skin) is as shown in the diagram. The marginal cost of a Botox injection is $1,000 and the procedure is not currently covered by health insurance. By how much will total economic surplus change if the city council passes a law requiring employers to include full reimbursement for Botox injections in their employees’ health coverage? LO1