What term describes achieving desired results without unnecessary expenditure?

The term that describes achieving desired results without unnecessary expenditure is "Cost-effectiveness." This concept emphasizes not just the result achieved, but the value derived from the resources used to achieve that result. In a cost-effective solution, the benefits gained should justify the costs incurred, ensuring that resources are spent wisely to maximize results without overspending.

While efficiency generally refers to the performance of tasks in a productive manner, it does not specifically address the aspect of minimizing costs relative to output. Resource optimization focuses on utilizing resources to their fullest potential but does not inherently consider the cost-effectiveness of those resources. Budget compliance involves adhering strictly to predetermined budgets but does not inherently imply that the results achieved are the most cost-effective. In this context, cost-effectiveness encompasses the broader measure of value relative to expenditures, making it the most appropriate choice.