Which three groups are crucial to putting technical change in agriculture into practice?

Question

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Agricultural researchers play a crucial role in developing new technologies and practices, extension agents help to disseminate these innovations to farmers, and end users (such as consumers and food processing companies) provide a market incentive for farmers to adopt new technologies. Managers, laborers, bankers, government bureaucrats, and large corporations may also play important roles in agriculture, but they are not necessarily central to the process of putting technical change into practice.

Which Three Groups Are Crucial to Putting Technical Change in Agriculture