The article is the third in a five-part series focusing on the restructuring of Brazil's fiscal policy. It builds upon previous articles by first motivating the discussion regarding fiscal rules, and then addressing the principles of sound fiscal adjustments. Here, the emphasis is placed on the evolution of these fiscal rules in response to governments' tendencies to overspend, particularly over the past thirty years, making them the primary tool against unsustainable public debt.

The article outlines the ongoing international challenge regarding fiscal rules, which must balance simplicity, flexibility, and enforceability. Simplicity is crucial for effective communication and monitoring, enabling both the government and the public to understand and follow the rules. Flexibility is necessary to adapt to unpredictable shocks such as pandemics or wars, while enforceability ensures that fiscal rules are not just aspirational but backed by mechanisms for accountability and penalties for non-compliance.

The narrative indicates that fiscal rules have evolved through 'generations' to accommodate changing circumstances and to ensure their effectiveness. This evolution reflects the need for these rules to adapt over time, highlighting the lessons learned from past crises and the necessity for rules that are not only theoretical but practical and sustainable in the long run.