parsimony

Unusual or excessive frugality; extreme economy or stinginess.

Adoption of the simplest assumption in the formulation of a theory or in the interpretation of data, especially in accordance with the rule of Ockham’s razor.

Sparingness in the use or expenditure of means; most commonly, excessive or unnecessary economy; stinginess; niggardliness.

Synonyms Stinginess, niggardliness, penuriousness. See penurious.

Closeness or sparingness in the expenditure of money; — generally in a bad sense; excessive frugality; niggardliness.

Great reluctance to spend money unnecessarily.

By analogy from (1), principle of using the least resources or explanations to solve a problem.

extreme stinginess

extreme care in spending money; reluctance to spend money unnecessarily