Which digital retail innovation was first mandated for all U.S. federal procurement transactions in 2008, revolutionizing government purchasing?

Public sector procurement has undergone massive digital transformation in recent years. Government agencies worldwide have adopted sophisticated e-procurement systems to increase transparency, reduce corruption, and improve efficiency in public spending. This trivia question tests your knowledge about a significant milestone in the modernization of government retail purchasing systems that has shaped how taxpayer dollars are spent.

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Universal Product Code (UPC) scanning
Wide Area Workflow (WAWF) e-invoicing
Blockchain-based contract verification
Artificial intelligence price optimization