This is a question of comparative specialisation. Why learn how to grow an amazing garden, invest hundreds of hours in working that garden, to save a few hundre

This is a question of comparative specialisation. Why learn how to grow an amazing garden, invest hundreds of hours in working that garden, to save a few hundred dollars (and losing the opportunity to earn tens of thousands of dollars) if you can just go to supermarket and buy food? Why hire a strategic analyst with executive experience for 5 years if all they are going to tell you is 5% more than a Gartner consultant can offer you for 1/10th the annual salary? To use your analogy, why should this hypothetical retailer hire an in-house team if they can get everything they need from another party for cheaper, with a small opportunity cost? And why is knowing which detergent to purchase making you any less reliant on the comparative specialisation of the supermarket?