Which of the Following Equations Is Incorrect

question 17

Multiple Choice

Which of the following equations is incorrect?

• A) Cov(R_i,R_j) = Σ(R_i - R_i)(R_j - R_j)
• B) Var(R_p) = x₁^2Var(R₁) + x₂^2Var(R₂) + 2X₁X₂Cov(R₁,R₂)
• C) Corr(R_i,R_j) =
• D) Cov(R_i,R_j) = E[(R_i - E[R_i])(R_j - E[R_j])]

---

Definitions:

Marginal Revenue Curve

A graph showing the change in total revenue for a business that results from selling one additional unit of a product or service.

Perfectly Competitive Industry

A theoretical market structure where there are many buyers and sellers, homogeneous products, no barriers to entry and exit, and perfect information, leading to an efficient allocation of resources.

Market Price

The existing rate at which a service or asset is available for purchase or sale on the open market.

Perfectly Competitive Market

A market structure characterized by many buyers and sellers, free entry and exit from the market, homogeneous products, and perfect information where no single participant can influence the price.