Labor (2) Production (Economic theory) (2) Factor analysis (2) Equations (2) Business enterprises (2) Factores (2) Análisis factorial (2) Empresas (2) Ecuaciones (2) Producción (2) Trabajo (2) production (2) Total productive maintenance (1) Greenhouse gases (1) Weights and measures (1) Valuation (1) Twenty-first century (1) Trials (1) Temperature (1) Success (1) Social sciences (1) Profit (1) Machinery (1) Liberty (1) Kindness (1) Industries (1) Identification (1) Id (Psychology) (1) Food supply (1) Experience (1)