The assurance of the quality of goods and services is today an essential element of modern economic regulation. In a context of growing economic integration, expansion of international trade, and intensified circulation of products across different markets, the existence of reliable technical standards has become a determining factor in ensuring trust in economic transactions, consumer safety, and business competitiveness.

Public-Private Partnerships (“PPPs”) are a legal instrument through which the State and the private sector cooperate in the implementation of strategic investments, particularly in the construction, financing and operation of infrastructure and public services.

This article aims to provide a brief explanation of the commercial interest rate within the framework of Decree-Law No. 3/2022 of 25 May, which approved the “new” Legal Regime of Commercial Contracts (hereinafter referred to as RJCC). This article does not address interest rates applicable to bank credit, that is, loans granted by licensed credit institutions and financial entities whose corporate purpose includes the granting of credit (for example, banks).