Consider Johnson & Johnson $($JNJ$)$ and Pfeizer $($PFE$).$ What have been their balance sheet debt$-$equity ratios over the past $10$ years? What have been their market value debt$-$equity ratios over the past $10$ years? Based on your results, do you find evidence of an ideal $($sweet spot$)$ capital structure in the Drug Manufacturing industry or do you think the companies are following a different approach? Explain.