This is literally creating local jobs. A job equals more income than no job. So this is raising incomes. In addition, there's less capital leaving the country buying foreign produce. So the money that would be spent anyway creates a local job, and in return is again spent locally by a Ghanaian farmer, instead of spent in Europe by a Dutch farmer. This is literally a win all around. An economy is a system, you can't just one day create amazing jobs without an entire support system around them.