a$)$ How could a supplier with a lower unit price quoted for a given part to be supplied end up costing the buyer more than another supplier quoting a higher price for the same part? Provide at least three reasons.

b$)$ Many firms offer their sales force monetary incentives based on exceeding a specific target. Specify one potential negative impact of such incentives on supply chain coordination. How would the structure of such incentives be modified to mitigate the negative impact?