Which of these segments has the lowest revenue contribution based on the provided data?

The segment with the lowest revenue contribution is Asset Management. In a financial institution, revenue contributions from various segments can significantly differ due to their nature of operations and the services they provide.

Asset Management typically involves managing investments on behalf of clients, which may generate fee income, but often does not match the transactional volume found in other segments like Trading and Sales or Retail Brokerage. These latter segments tend to benefit from high transaction volumes and spreads, leading to greater revenue generation.

Commercial Banking also tends to generate substantial revenue through interest from loans and fees from various services, thus also witnessing higher revenue contributions compared to Asset Management.

While all segments have their distinct roles and revenue mechanisms, Asset Management usually represents a smaller part of the overall revenue pie due to its reliance on ongoing management fees, which can be more stable but less volatile compared to the other segments that engage in more active trading and client transactions.