E.g. you could give someone insurance on their stock position if you can take the risk. This allows them to participate in the game so you both benefit.
Another is that you might be able to lend more cheaply than the other can loan but they want to leverage up their portfolio. With options you can effectively make a cheaper loan to them to purchase a specific product. They lend more cheaply, you make part of the spread.
It is not a "politician makes non-promise" story. It is actually a very credible claim because the Japanese government doesn't even need more tax income as they can lend freely.
The government can lend as much Yen as they want. The tax hike is something that can help them get inflation, which has been too low for very long.
> more then
The future has arrived.