Transparency: All data is public so anyone can verify it,
Security: Because millions of decentralized ledgers share the same data and verify the transactions
Improved traceability: Since most blockchains are opensource and share their transactions you can easily trace anything,
Increased efficiency and speed: with quick verifications on the blockchain you know that the information/transaction is true, you can because of this skip all work with due diligence.
Reduced cost: Same with Due Diligence for example, it cost a lot to do a verification of a retailer, also with less middle men, there is more money over for the seller and buyer.