How much of our time and money should we spend on our best products and business units to ensure that they continue to be successful? How much of our time and money should we spend developing new costly products, most of which will never be successful?

 Time and money

1. How much of our time and money should we spend on our best products and business units to ensure that they continue to be successful?
2. How much of our time and money should we spend developing new costly products, most of which will never be successful?