Why is the output not printing ">=" when I click the textbutton?

game.Players.PlayerAdded:Connect(function(player)
	print(player.Name.."has joined")
		local Cash = player:WaitForChild("leaderstats").Cash.Value
		if Cash then
		print("foundCash")
		script.Parent.MouseButton1Click:Connect(function()
	print("ClickedBuy")
	local price = script.Parent.Parent.Price.Value
		if Cash >= price then
			print(">=")
			end
		end)
	end
end)

If this is a server script, you would have to put it into a local script, and at the beginning don't put "player" after function because you have game.Players.LocalPlayer

Edit: I just realized another error in your code. When you say:

local price = script.Parent.Parent.Price.Value

You should have said:

local price = script.Parent.Parent.Price

And instead of:

if Cash >= price then

You would do:

if Cash >= price.Value then

You would do the same thing with the cash variable, and in the end, it would look like this.

     local player = game.Players.LocalPlayer   
	local Cash = player:WaitForChild("leaderstats").Cash
        if Cash then
        print("foundCash")
        script.Parent.MouseButton1Click:Connect(function()
    print("ClickedBuy")
    local price = script.Parent.Parent.Price
        if Cash.Value >= price.Value then
            print(">=")
            end
        end)
    end

You can copy and paste if you want.

You have to separate server code from GUI code. The server should (as you have there) be making sure that the player has enough money - but it shouldn't be directly responding to the player pressing a button. Your GUI code should use a RemoteEvent to inform the server of the player's wishes; the server should then confirm that the player can do that.

Resources:

• https://scriptinghelpers.org/guides/server-client-relationship-in-roblox
• https://scriptinghelpers.org/guides/how-to-use-remoteevents-properly

Also note that server scripts don't run when placed in StarterGui - they can be in the workspace or ServerScriptService, see https://developer.roblox.com/api-reference/class/Script