currency not turning into other currency?

i am making a cash to gold system where if the player get 10,000 cash it would turn into gold. there are no errors but its not turning into gold here is me script:

game.Players.PlayerAdded:Connect(function(player)
    local stats = Instance.new("Folder",player)
	stats.Name = "leaderstats"
	
	local cash = Instance.new("IntValue",stats)
	cash.Name = "Cash"
	cash.Value = 10
	
	local gold = Instance.new("IntValue",stats)
	gold.Name = "Gold"
	gold.Value = 0


    cash.Changed:Connect(function()
        player.leaderstats.Cash.Value = player.leaderstats.Cash.Value - 0 -- this takes away the cash
		player.leaderstats.Gold.Value = player.leaderstats.Gold.Value + 1

    end)
end)