if 100yen to the dollar, aus dollar is good return since the yen is really high. Its not 1 yen to the dollar, its 100yen to the dollar.
If there is only one buyer for goods and lots of goods, then the power lies with the buyer, not the seller, which means that if toyota was alone it could command whatever price it wanted, with only a few players, ref they only assemble here, they don't manufacture anyway, they still command the price they want anyway.