Share your insights or perspective on the financial matter presented in the input.

Definitions of leverage and of leverage factor
This would clear out a lot more. 1) Leverage is the act of taking on debt in lieu of the equity you hold. Not always related to firms, it applies to personal situations too. When you take a loan, you get a certain %age of the loan, the bank establishes your equity by looking at your past financial records and then decides the amount it is going to lend, deciding on the safest leverage. In the current action leverage is the whole act of borrowing yen and profiting from it. The leverage factor mentions the amount of leverage happening. 10000 yen being borrowed with an equity of 1000 yen. 2) Commercial banks: 10 to 1 -> They don't deal in complicated investments, derivatives except for hedging, and are under stricter controls of the government. They have to have certain amount of liquidity and can loan out the rest for business. Investment banks: 30 to 1 -> Their main idea is making money and trade heavily. Their deposits are limited by the amount clients have deposited. And as their main motive is to get maximum returns from the available amount, they trade heavily. Derivatives, one of the instruments, are structured on underlyings and sometimes in multiple layers which build up quite a bit of leverage. And all of the trades happen on margins. You don't invest $10k to buy $10k of a traded stock. You put in, maybe $500 to take up the position and borrow the rest of the amount per se. It improves liquidity in the markets and increases efficiency. Else you could do only with what you have. So these margins add up to the leverage the bank is taking on.