In developing countries, small businesses employ a disproportionate share of the population: SMEs comprise two-thirds of formal private sector employment in emerging markets and create 95 percent of jobs in low income countries. They take many forms, from mobile food vendor to technology firm, and they can be incubators of creativity. But, as studies have shown, on average, they account for a smaller share of productivity growth than large firms. This week I am in Kigali, Rwanda, to participate in the World Export Development Forum.