In the case of Mexico, the total surplus is USD 2.30 billion, and the consumer portion was 8 per cent. In general terms, the authors concluded that the total broadband surplus is directly related to broadband penetration. Microeconomic research has yielded the following estimates of firm productivity enhancement (see Table 5). The author found that in the manufacturing sector firms with Internet access enabled by broadband generate 6 per cent more foreign sales than the rest.