高盛观点 | 为何全球股市尚未陷入泡沫

Core Viewpoint - The current stock market rally, driven by strong fundamentals, has raised concerns about a potential bubble, but Goldman Sachs' chief global equity strategist Peter Oppenheimer argues that the market has not yet entered a bubble phase despite some historical similarities [1][2]. Group 1: Characteristics of Asset Bubbles - Historical asset bubbles are often fueled by excitement around transformative technologies, leading to excessive price increases and speculation beyond fundamental values [2]. - The current market shows a high concentration of leadership, with the top ten companies in the U.S. accounting for nearly a quarter of the global stock market value, predominantly in the tech sector [2]. Group 2: IPO and M&A Market Trends - The IPO and M&A markets are heating up, with the average first-day IPO premium in the U.S. reaching 30%, the highest since the late 1990s tech bubble [4]. - While there are signs of excess, the current IPO activity is not comparable to the speculative IPOs of the past, as most tech investments are driven by mature companies' capital expenditures rather than high-risk leverage [4][5]. Group 3: Capital Expenditure and Financial Health - Although capital expenditures relative to sales have increased, they remain below historical bubble levels, and leverage is controlled, with most spending funded by internal cash flow rather than debt [5][6]. - The increase in bond issuance by large tech companies does not indicate a bubble, as their overall financial health remains robust, reducing systemic risk [6]. Group 4: Investment Strategy Recommendations - Investors are advised to focus on diversification, closely monitor capital expenditures and leverage, and avoid overpaying for companies lacking a track record [8]. - Opportunities should be sought in adjacent sectors such as infrastructure and resources, which are crucial for supporting AI development, while being cautious of rising leverage in large tech companies [8].