The four tests of sustainable competitive advantage are:
The technological change lowers costs or enhances differentiation and provides a sustainable (i.e., inimitable) technological advantage.
The technological change shifts cost or uniqueness drivers in favor of a firm.
Pioneering the technological change translates into first-mover advantages besides those inherent in the technology itself.
The technological change improves overall industry structure.
Provide a real life business example of a technology company or product and go over how it met OR failed in these four areas (if it failed then the company could not meet that sustainability factor and failed to keep their competitive advantage)