Is it the cost of debt, or the cost of equity that is driving Boeing's overall cost of capital (WACC)? Would the answer change depending on the company being considered? Explain.

Earnings per Share and Stock Price Fiscal Year from 2010 to 2017, Earnings per share on left axis and bar, stock price is right axis and line Boeing Days Payable Outstanding Fiscal Year from 2010 to 2017 DPO = Accounts Payable /( COGS/365). Boeing Gross Margin (Revenues or sales - main cost item Fiscal Year from 2010 to 2017 COGS)/Revenues Earnings per Share and Stock Price Fiscal Year from 2010 to 2017, Earnings per share on left axis and bar, stock price is right axis and line Boeing Days Payable Outstanding Fiscal Year from 2010 to 2017 DPO = Accounts Payable /( COGS/365). Boeing Gross Margin (Revenues or sales - main cost item Fiscal Year from 2010 to 2017 COGS)/Revenues