Answer:
The real options perspective.
Step-by-step explanation:
Real options perspective makes use of logic in financial decisions involving capital investments. Where and when to make capital investments are made based on logical deductions.
In this instance Roche adopted a wait and see strategy. It invested $2.1 billion to purchase a controlling interest in the biotech startup Genentech. After it saw good performance from them Roche now spent $47 billion to purchase the remaining minority interest in Genentech, making it a wholly owned subsidiary.