Centre (1) Bénin (1) Assaying (1) Statistics (1) Factors of production (1) Cost of sales (1) Vision (1) Service industries (1) Rice farmers (1) Rice--Planting (1) Rice (1) Respect (1) Questionnaires (1) Production (Economic theory) (1) Marital property (1) Income (1) Farms (1) Contract labor (1) Black market (1) Statistics (1) Prizes, etc (1) Use (1) Usage (1) Analysis (1) Services for (1) Science (1) Labor productivity (1) Educación--Fines y objetivos (1) Trabajo--Productividad (1) Empresas de servicios (1)