To write economically, you should eliminate surplus words.

Surplus Words

Extra or unnecessary words in a sentence or text that do not add meaning and can be removed without changing the message.

Economically

Pertaining to the economy or the management of resources, often focusing on efficiency and effectiveness in financial terms.

Write

To write means to mark coherent words on paper or another surface, typically using a tool such as a pen or keyboard, to communicate ideas, stories, or information.