Correct spelling, explanation: economy is the correct form, as the word comes from Greek oikonomia (household management), which is also spelled n first and then m. Therefore ecomony is probably just a typo. Economy is the only correct spelling.

Definition of economy:
noun, set of activities that are gathered around resources and their management
Our household economy isn’t very efficient, we need to make some changes.
Nobody could forecast how covid pandemic influenced the global economy.

Incorrect spelling, explanation: ecomony is incorrect as the correct form is economy from Greek oikonomia. You can see that the spelling is similar. Economy is thus the correct form.