Section 4Sec./Art. 4

The ad valorem rates herein of import duties indicated hereof shall be subject to modification by Congress after review and recommendation by the National Economic and Development Authority after one (1) year from the effectivity of the rates prescribed: Provided, That before any recommendation is submitted to Congress pursuant to this Section, the Tariff Commission shall conduct an investigation in the course of which shall hold public hearings wherein interested parties shall be afforded reasonable opportunity to be present, produce evidence and to be heard. The Tariff Commission shall also hear the views and recommendations of any government office, agency or instrumentality concerned.1шphi1

Subject to the provisions of the preceding paragraph, the National Economic and Development Authority shall recommend to Congress the necessary adjustment in such specific rates of import duties indicates thereof after six (6) months from their effectivity: Provided, finally, That the President may not increase or decrease any ad valorem or specific duty rates herein provided when Congress is in session.