Why do you suppose the average costs of performing many distribution tasks are lower for intermediaries and

Question:

Why do you suppose the average costs of performing many tasks are lower for intermediaries and facilitating agencies than for producers and manufacturers?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...