According to Bucklin, the issue of channel performance focuses on the conflict between two major dimensions of channel performance. On the one hand, con- sumers and users are concerned primarily with lowering the costs of the goods and services sold and, therefore, with reducing the costs of distribution. On the other hand, buyers want to benefit from and receive some marketing services in conjunc- tion with the good or service they purchase. However, provision of these services increases the cost of distribution. Compare and contrast vertical integration and out sourcing relative to the performance dimensions mentioned by Bucklin. Which would tend to be superior overall?