Economists measure the personal satisfaction someone gets from consuming goods and services with the concept of?

UTILITY

Explanation:

The economists make use of the UTILITY concept for measuring the level of personal satisfaction regarding consumer goods and services. And the utility means the complete satisfaction that is being derived from the consumption of goods and services. Also, the utility of these services and goods does have a direct effect on the demand, and hence the product price.

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the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses