Good luck finding this out. Only top executives at these companies know the answer and they would never divulge them to anyone outside the inner circle. So we are left to conjecture. It is unlikely that a production run of less than 1000 units would be cost-effective for manufactures like JVC or Sony. Of course they produce to a world market, so a run might well be multiple times this number. If I had to guess, I'd say a yearly production on the order of 15 to 20 thousand might satisfy world-wide demand, with Sony enjoying more numbers than JVC.