Грамматика и Лексика

Преобразуйте, если это необходимо, слово EMPLOY так, чтобы оно грамматически соответствовало содержанию текста.

Each KidZania city operates with a currency, named ‘kidZo’, which enables participants to learn about managing money by earning kidZos through ______, letting them acquire goods and services as customers, saving into bank accounts and paying taxes.