In this case, the car dealer is offering Jasdeep the option to pay the remaining amount after the car has been customized. This indicates that the car dealer is using a form of credit to fund the customization. The short-term source of capital used by the car dealer here is likely trade credit, where the dealer allows the customer to make a partial payment upfront and the remaining amount after a certain period (in this case, after the customization of the car).
Final Answer:
The short-term source of capital used by the car dealer is trade credit.