Final answer:
The value calculation for Companies A and B using net income and Net operating income approaches cannot be completed without further specifics. The after-tax WACC for each would include proportions of debt and equity and respective costs. The process to equivalate income at less cost would involve arbitrage and it would stop when no more arbitrage opportunities are present.
Step-by-step explanation:
The given problem is a classic scenario in corporate finance, assessing the impact of financial structure on the value of firms using different approaches. In order to compute the value of Company A and B using the net income (NI) and Net operating income (NOI) approaches and then assess their capital structures, we would need to perform a series of calculations based on the data provided: the return on total assets, the interest on bonds, the tax rate, etc. However, the calculation specifics and the answers, such as the firms' valuations being $102 million or the investment decisions based on societal return and financial capital cost, are not provided within the question.
For the NOI approach, the process involves deducting interest and taxes from the operating income to find the net income and then valuing the firm based on the capitalization rate. Contrarily, the NI approach accounts for the impact of leverage, so Company A's value will be different because of its debt. Evaluating the after-tax weighted average cost of capital (WACC) for each would then require considering the firm's debt and equity proportions alongside the cost of each capital component.
According to the NOI approach, assuming that capital markets are perfect and investors are rational, the firm's value does not depend on its capital structure, meaning that firms A and B would have the same value. However, if you own 10% of A's shares, arbitrage opportunities may arise, allowing you to increase your income or decrease your costs due to the differences in capital structure. This arbitrage process would stop when the costs of holding A's shares equal the benefits with no further arbitrage opportunity.