Yes.
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efficiency
Total factor productivity is the ratio of total value added and the total cost of inputs.
Depends on what you're referring to. Input could be a switch for example, output would be a fan or light coming on. Eating is an input, you can guess what your output is?
It means that an input of 1 unit should result in an output of 1.8 units. The exact output depends on whether the ratio is adjusted for "leakages". In any real machine, some of the force is used up to overcome friction, slippage and so on.
It is a function with fractions as output.