Analyze the major investment projects undertaken in the last five years by Amazon. Provide relevant details (cost and brief description of the investment, type of securities issued, etc.).

Evaluate the Amazon current optimal financing mix (use of debt, common stock, and preferred shares). Provide relevant details regarding the cost of each financing option (i.e., cost of equity, cost of debt, cost of preferred shares), the weighted average cost of capital (WACC), and levered and unlevered betas.