The expected rate of return of a portfolio of risky securities is the weighted sum of the securities' variances the sum of the securities' covariances the sum of the securities' variances the weighted sum of the securities' expected returns

The prebisch–singer hypothesis concludes that: a. technology lowers the cost of manufactured products, so developing countries should see an increase in their terms of trade. b. developing countries experience a long-run decline in their terms of trade, as the demand for primary products in higher-income countries declines relative to their demand for manufactured goods. c. because of unfair trading practices, labor in developing countries is exploited. d. opec has been responsible for a slowdown in the world's standard of living.

Select the correct answer. ramon applied to the state university in the city where he lives, but he was denied admission. what should he do now? a. change his mind about graduating and drop out of high school so he can start working right away. b. decide not to go to college, because he didn’t have a backup plan. c. stay positive and write a mean letter to let the college know that they made a bad decision. d. learn from this opportunity, reevaluate his options, and apply to his second and third choices.

The common stock and debt of northern sludge are valued at $65 million and $35 million, respectively. investors currently require a return of 15.9% on the common stock and a return of 7.8% on the debt. if northern sludge issues an additional $14 million of common stock and uses this money to retire debt, what happens to the expected return on the stock? assume that the change in capital structure does not affect the interest rate on northern’s debt and that there are no taxes.