Which of the following statements is NOT correct?

		When calculating the cost of common stock, companies don't have to adjust for taxes.
		When calculating the cost of debt, a company needs to adjust for taxes, because interest payments are deductible by the paying corporation.
		A decrease in the risk-free rate will increase the cost of common stock.
		If a companys beta increases, this will increase the cost of equity used to calculate the WACC.