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Value is explained in various ways. Many encyclopedia make a difference between economic value indicating an absolute amount in currency, versus a marketing value indicating a relative advantage over a perceived quality.

This is what wikipedia says about economic versus marketing value:

• In general, the economic value of something is how much a product or service is worth to someone relative to other things (often measured in money). It can be either an assessment of what it could or should be worth (valuation), or an explanation of its actual market value (price).

• Value of a product within the context of marketing means the relationship between the consumer's expectations of product quality to the actual amount paid for it. Value in marketing can be defined by both qualitative and quantitative measures. On the qualitative side, value is the perceived gain composed of individual's emotional, mental and physical condition plus various social, economic, cultural and environmental factors. On the quantitative side, value is the actual gain measured in terms of financial numbers, percentages, and dollars.

And here are some other definitions found on internet:

• Merriam-Webster:
  1: a fair return or equivalent in goods, services, or money for something exchanged
  2: the monetary worth of something
  3: relative worth, utility, or importance
  4: a numerical quantity that is assigned or is determined by calculation or measurement
• Oxford English Dictionary:
  1 the regard that something is held to deserve; importance or worth.
  2 material or monetary worth.
  3 (values) principles or standards of behaviour.
  4 the numerical amount denoted by an algebraic term; a magnitude, quantity, or number.