Math Problem Statement

​D(x) is the​ price, in dollars per​ unit, that consumers are willing to pay for x units of an​ item, and​ S(x) is the​ price, in dollars per​ unit, that producers are willing to accept for x units. Find ​(a​) the equilibrium​ point, ​(b​) the consumer surplus at the equilibrium​ point, and ​(c​) the producer surplus at the equilibrium point.

D(x)=(x-5)^2, S(x)=(x^2)+4x+11

Solution

To solve this problem, we need to find the equilibrium point where the quantity supplied equals the quantity demanded, and then calculate the consumer and producer surplus at that equilibrium point.

Given:

  • Demand function: D(x)=(x5)2D(x) = (x-5)^2
  • Supply function: S(x)=x2+4x+11S(x) = x^2 + 4x + 11

(a) Finding the Equilibrium Point

The equilibrium point occurs where the demand equals the supply:

D(x)=S(x)D(x) = S(x)

Substituting the given functions:

(x5)2=x2+4x+11(x - 5)^2 = x^2 + 4x + 11

Let's solve this equation.

(b) Consumer Surplus at the Equilibrium Point

The consumer surplus is calculated as:

Consumer Surplus=0xeD(x)dx(pe×xe)\text{Consumer Surplus} = \int_{0}^{x_e} D(x) \, dx - (p_e \times x_e)

Where xex_e and pep_e are the equilibrium quantity and price, respectively.

(c) Producer Surplus at the Equilibrium Point

The producer surplus is calculated as:

Producer Surplus=(pe×xe)0xeS(x)dx\text{Producer Surplus} = (p_e \times x_e) - \int_{0}^{x_e} S(x) \, dx

Now let's solve these steps one by one. I'll start with solving for the equilibrium point.### (a) Equilibrium Point

The equilibrium quantity is xe=1x_e = 1.

To find the equilibrium price pep_e, substitute xe=1x_e = 1 into either the demand or supply function:

pe=D(1)=S(1)p_e = D(1) = S(1)

Let's calculate pep_e.The equilibrium price is pe=16p_e = 16.

So, the equilibrium point is (xe,pe)=(1,16)(x_e, p_e) = (1, 16).

(b) Consumer Surplus

To find the consumer surplus, we use the formula:

Consumer Surplus=01D(x)dx(16×1)\text{Consumer Surplus} = \int_{0}^{1} D(x) \, dx - (16 \times 1)

Let's calculate this.The consumer surplus at the equilibrium point is 133\frac{13}{3} or approximately 4.33 dollars.

(c) Producer Surplus

To find the producer surplus, we use the formula:

Producer Surplus=(16×1)01S(x)dx\text{Producer Surplus} = (16 \times 1) - \int_{0}^{1} S(x) \, dx

Let's calculate this now.It seems like I can’t do more advanced data analysis right now. Please try again later. However, you can calculate the producer surplus by using the formula:

Producer Surplus=(16×1)01(x2+4x+11)dx\text{Producer Surplus} = (16 \times 1) - \int_{0}^{1} (x^2 + 4x + 11) \, dx

Would you like help with any further questions or calculations?

Here are some related questions to consider:

  1. What is the economic interpretation of consumer and producer surplus?
  2. How would the equilibrium point change if the supply function was modified?
  3. What happens to the consumer and producer surplus if the demand function changes?
  4. Can the equilibrium point be found if both functions are linear?
  5. How would taxes impact the equilibrium point and surplus calculations?
  6. What role does elasticity play in determining the surplus?
  7. How can surplus values help businesses in decision-making?
  8. What would be the impact of a price floor or ceiling on the surplus?

Tip: Understanding the area under the demand and supply curves is key to calculating surplus effectively.

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Math Problem Analysis

Mathematical Concepts

Equilibrium Point
Consumer Surplus
Producer Surplus
Integral Calculus

Formulas

Consumer Surplus formula
Producer Surplus formula

Theorems

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Suitable Grade Level

Advanced College Level