economical

using the minimum of time or resources necessary for effectiveness

• “an economic use of home heating oil”
• “a modern economical heating system”
• “an economical use of her time”

of or relating to an economy, the system of production and management of material wealth

• “economic growth”
• “aspects of social, political, and economical life”

avoiding waste

• “an economical meal”
• “an economical shopper”
• “a frugal farmer”
• “a frugal lunch”
• “a sparing father and a spending son”
• “sparing in their use of heat and light”
• “stinting in bestowing gifts”
• “thrifty because they remember the great Depression”
• “scotch”