Pfizer is one of the worlds largest pharmaceutical companies. Developing its COVID-19 vaccine is a costly, uncertain and complex process. This company would need to consider which parts of the vertical chain to outsource and which to conduct inhouse. Using the theory of the optimal boundary of the firm, discuss Pfizers make-or-buy decision for developing and producing its COVID vaccine. What stages of the vertical chain should Pfizer consider conducting inhouse, and which should be outsourced? Provide reasons for your findings.