Today, there are situations when we actually add a middle person instead of eliminating one for increased service efficiency. If its cost-effective and demand is high, then proper market positioning will make it a worthwhile endeavor. For example, my sister just informed me of a food delivery service in New Mexico that will let you choose one out of many different food outlets (all types of ethnic/fast food)- and then guarantees delivery within a specific time period. This not only gives the customer assurance of reliability, but more choices for dining take out style.
In other areas of industry, the same idea holds true. There are electrical suppliers that no longer manufacture the product of electricity, but now are involved only in the delivery process of electricity to the customers. Because of market fluctuations, the new delivery supplier will utilize many other different energy suppliers to get the product of electricity to the customer efficiently and at the best market price. Again, adding the middle man seems to benefit all around.
In relating this theory to restaurants, it is the food runner that has become popular, especially in the larger dining...