"Economy" can be interpreted in a couple ways.
The most obvious is using language with the least amount of adornment, which is typically using direct verbs and minimizing the use of adverbs and adjectives, as one might see in a Hemingway novel. (It's partly why he comes across as such a prick in his writing even if you're unfamiliar with his life.)
A slightly more specialized interpretation is using phrasing that flows easier, such as a Shakespearean soliloquy. This relies on arranging a complete phrase in a way that keeps a steady flow of stressed and unstressed syllables, disrupting that flow sparingly to great effect, and, importantly, uses stressed syllables to convey a secondary narration.
These principles are fairly universal across all languages, though how language is stressed varies obviously.