The Services Sectors Figure 24.1: Relationship between The Commodity Producing Sectors and Services Sectors *Wholesale and Retail Trade, Transport and Communications and Banking and Insurance. **Housing, Public Admin& Defence and Community, Social Services and Personal Services. 24.2. Wholesale and Retail Trade Characteristics of Sector There are two critical determinants of the value added generated in the sector. The first is the share of output marketed of agricultural commodities. This can range from approximately 70 percent in the case of wheat and milk to almost 90 percent in the case of other food crops and livestock products. Second, the trading margins can range from 10 percent to over 40 percent. Overall, PBS has derived that the largest contribution to value added in the sector is through trading in domestically manufactured goods with a share of over 58 percent. The contribution of agriculture is 24 percent and 18 percent by imports respectively. The Census of Establishments by PBS reveals the extreme concentration of trade in small units. Almost 96 percent of the employment is in establishments with one to five workers only. 233