Why is buying local so expensive?

I've noticed that when I shop locally, prices tend to be much higher than if I were to purchase items online or from larger retailers. Can you explain why buying local is often so expensive? Are there any benefits to paying the extra cost that might justify the higher prices? Additionally, are there any strategies or tips I can use to find more affordable options when shopping locally? Understanding the reasons behind the higher prices and the potential benefits of shopping locally would be greatly appreciated.