The word "economical" means being efficient and careful with money or resources. It is about making smart choices to save money or use resources wisely. Full definition
So having the ship to sleep on and have breakfast and dinner on made the destination more more economical than it would be otherwise. (familyadventureproject.org)
However, it is not the most economical for most families. (myorganicformula.com)
So many nut butters are so expensive, but this would be a much more economical way to do it! (happyhealthymotivated.com)