Explanation:
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Answer:
Definition: The unobservable market force that helps the demand and supply of goods in a free market to reach equilibrium automatically is the invisible hand. Description: The phrase invisible hand was introduced by Adam Smith in his book 'The Wealth of Nations'.
so ans is the invisible hand
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Answer: Validity
Explanation:Validity is the type of claim that is made towards the measuring of reliability of any element. The differences appearing in the measurement of the elements displays the validly factor is not up to the mark which indirectly implies that reliability is not high. Validity is the situation in which all the parameters appearing in the element is perfect. If validity is perfect then only perfect reliability is achieved.