The phrase "is economical" conveys the idea of being cost-effective and efficient. There are several synonyms that can be used in place of this phrase to enhance its meaning or convey the same message in a more nuanced way. For instance, the term "frugal" underscores the notion of being thrifty and making wise use of resources. Similarly, "prudent" indicates sound judgment and careful management of finances. "Sustainable" emphasizes the idea of conserving resources for long-term benefits. "Economic" suggests the utilization of resources in an efficient and productive manner. Ultimately, all these synonyms capture the essence of being economical, but each adds a slightly different shade of meaning.