Consider a consumer who has an experienced utility function given by UEU(x,m)=2sqrtx+m. Let q denote the market price of good x, and assume that it remains fixed throughout the problem.
The company selling the good x starts an advertisement campagin that has the following effect on the consumer: he makes decisions as if maximizing a decision utility function given by UDU(x,m)=4sqrtx+m.
Write down the expression for the difference between the consumer demand and his optimal level of consumption.