adequacy,
sufficiency the quality of being able to meet a need satisfactorily: "he questioned the adequacy of the usual sentimental interpretation of the Golden Rule"
amount the relative magnitude of something with reference to a criterion; "an adequate amount of food for four people"
shortfall,
shortage,
deficit the property of being an amount by which something is less than expected or required; "new blood vessels bud out from the already dilated vascular bed to make up the nutritional deficit"