Efficiency and Functionality

noun

• The ratio of the output to the input of any system.
• Skillfulness in avoiding wasted time and effort.
  • usage: "she did the work with great efficiency"

• (n.) The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
• (n.) The ratio of useful work to energy expended.

Efficiency is the degree and speed with which a market accurately incorporates information into prices.

noun

• Capable of serving a purpose well.
  • usage: "software with greater functionality"