Supply & Demand is a main story mission in GTA Vice City, given by Ricardo Diaz.
It's the 16° GTA Vice City mission in chronological order, and it becomes available after completing The Fastest Boat.
Tommy completes a drug deal and takes out several gunmen in a speedboat chase.
Supply & Demand: Mission Objectives
- Go to the fastest boat at the jetty.
 - Beat the other buyers to the yacht.
 - Protect the yacht while Lance drives it back to the mansion.
 
Supply & Demand: Mission Info
- Mission Number16
 - Mission TypeMandatory Mission
 -  Mission Giver

Ricardo Diaz - LocationDiaz's Mansion, Starfish Island
 - Available After Mission (Story Mode)
 - Required for 100%Yes
 
- Rewards$10,000; Black Tracksuit appears outside Jocksport in Downtown Vice City
 -  Unlocked Items
Death Row -  Featuring
Cuban Jetmax 
Marquis 
Sparrow 
Speeder 
Squalo 
Lance Vance 
Cubans 
Diaz's Gang - NotesIn the second half of the mission, the Ruger will have unlimited ammunition.