The most worthwhile thing to read in the book 'Big but Not Falling' is not who fell in 2008. But it tells you: The most dangerous time for the financial system is often not when losses first appear. But it's when everyone thinks the risk has been packaged, dispersed, and transferred. Lehman did not collapse in a day. The real problems have long been piling up in the real estate foam, excessive leverage, complex derivatives, short-term financing and market trust. By the time everyone realizes something's wrong, it's no longer a problem with any particular company. The collapse of an investment bank may affect banks, funds, insurance, money markets, and global capital markets. This is systemic risk. The most common mistake many people make when investing is to only look at the surface. Looking at the profit and loss statement, I feel that the company is making money. Judging from the rating, I feel that the assets are safe. Judging from the scale, I think the institution is very stable. Looking at the model, I feel that the risk is controllable. But the truly dangerous things are often hidden off balance sheet, in leverage, in liquidity, and on the line of mutual trust. The cruelest aspect of the financial crisis is: The risk will not disappear just because the packaging is changed. It just moved to a more difficult place to understand and continues to exist. Tools such as CDO and CDS could have been used to diversify risks. But when everyone uses it to pursue higher returns and create better book performance, the tool will in turn amplify the risk. This still applies today. Whether it's high leverage companies, complex financial products, or seemingly safe high-yield assets, as long as they rely on short-term bond long-term investment, liquidity renewal, and continuous financing, then we cannot just look at the yield. You have three questions to ask: Firstly, where does the money come from? Secondly, who bears the risk? Thirdly, once the financing is cut off, can it still survive? There is another very realistic aspect in 'Big but Not Falling': Saving or not saving itself is a dilemma. Not rescuing may trigger a system crash. Saved, it will create moral hazard again, making the market feel that there are also people who can take advantage of mistakes. So many crises are not seen by smart people, but rather everyone is trapped by their own position, interests, system, and time pressure. Investment is the same. You think you're looking at a company, but you actually need to look at the entire network it's on: Who is upstream, Who is downstream, Who does financing rely on, When will the debt mature, Can the cash flow withstand the stress test. Especially in bull markets, risk control is most easily marginalized. Everyone is talking about growth, valuation, and space. But what truly determines whether you can weather the cycle is often not the asset that rises the fastest, but the asset that can survive when a crisis strikes. For ordinary people, the biggest reminder of this book is simple: Don't mistake finance for cheap valuation. Don't mistake high leverage for high growth. Don't mistake short-term prosperity for long-term security. The most dangerous moment in the financial market is not when everyone is panicking. But it's when everyone feels that 'this time is different' and believes together that the risk has disappeared. The real big risks are never visible losses. But it is a systemic fragility that is concealed by prosperity, amplified by leverage, and suddenly erupts when confidence collapses.