Another distinction is between productive and unproductive labor. That helped develop a productive and profitable activity. Productivity has increased marginally, but is still low compared to highly productive regions. Agronomists study sustainable ways to make soils more productive and profitable throughout the world. Basic needs theory does not focus on investing in economically productive activities. Here, motivation is seen as key to keeping employees highly productive. This is one major reason for being less productive than cattle. The telecommuters were also more productive and happier. It typically entails support for highly competitive markets, private ownership of productive enterprises. There are good/productive and negative/counterproductive ways to handle stress. They are among the most productive and dynamic ecosystems on Earth. It is one of the most productive and globally competitive cities in the world. Wertheimer was interested in making a distinction between reproductive thinking and productive thinking. They are recognized as one of the most productive and dynamic ecosystems on Earth. The alliances were costly and not very productive.