With a comma? Ineffective doesn't mean no-effect, it means 'not the intended effect'. I.E. "McKinsey worked with Purdue to implement an ineffective business st

With a comma? Ineffective doesn't mean no-effect, it means 'not the intended effect'. I.E. "McKinsey worked with Purdue to implement an ineffective business strategy that resulted in bankruptcy for the business, due the harmful nature of the product and the predatory nature of the strategy."