Buffett's recent substantial purchase of Occidental Petroleum is imbued with multiple logics and closely relates to the global economic situation, warranting in-depth analysis.

1. Investment Value of Occidental Petroleum

(1) Stock Prices in the Value Range

Occidental Petroleum's stock price has experienced a period of decline, falling 35% since April of this year, nearly erasing all gains over the past two years. This decline has brought its stock price into Buffett's 'strike zone,' i.e., a reasonable or even undervalued range, providing Buffett with a good buying opportunity. Buffett has always emphasized value investing, looking for stocks priced below their intrinsic value, and Occidental Petroleum's stock price performance happens to meet this standard.

(2) Attractive Dividend Yield

The dividend yield of Occidental Petroleum is one of the important factors attracting Buffett. The preferred shares of Occidental Petroleum held by Buffett can provide a dividend yield of up to 8%, while the common stock has a dividend yield close to 2%, collectively bringing Buffett about 10% in annual dividend income. In the current low-interest-rate environment, such a dividend yield is undoubtedly very attractive, providing stable cash flow and a high return rate for Buffett's investment portfolio.

(3) Strong Fundamentals of the Company

Occidental Petroleum, as a medium-sized shale oil company with proper cost control, has production costs of around $40 per barrel, far below the trading price of West Texas Intermediate crude oil in the market. This allows Occidental Petroleum to maintain profitability even when oil prices fall, providing Buffett with stable investment returns. Additionally, Occidental Petroleum also has advantages in carbon capture technology, which not only helps it remain competitive in the context of increasingly strict environmental policies but may also bring additional revenues and market opportunities.

(4) Outstanding Management Capability

Buffett praised Occidental Petroleum's management for achieving significant results in reducing debt and capital expenditures, entering a period of stable development. An excellent management team is key to a company's success, as they can formulate reasonable strategic plans, effectively respond to market changes, and lead the company to achieve long-term stable development. Buffett has always focused on investing in companies with excellent management teams, and the performance of Occidental Petroleum's management aligns with his investment philosophy.

2. Global Economic Situation and the Oil Market

(1) Erosion of Petrodollar Dominance

Since the mid-1970s, the U.S. dollar has been linked to oil, forming the petrodollar system, which provides crucial support for the international status of the dollar. However, in recent years, signs of loosening have appeared in this system. In January last year, the Saudi finance minister publicly stated that Saudi Arabia is willing to introduce other currencies in oil trade. In June this year, Saudi Arabia joined a multilateral central bank digital currency bridge project led by the Bank for International Settlements and China. These measures indicate that oil-exporting countries like Saudi Arabia are starting to seek diversified settlement currencies to reduce dependence on the dollar. If significant changes occur in the petrodollar system, the U.S.'s dominant position in the global financial market may be affected, and the strong status of the dollar may also be challenged.

(2) Changes in Energy Supply and Demand Patterns

The changes in the global energy supply and demand patterns have also had a profound impact on the oil market. On one hand, with the recovery and growth of the global economy, the demand for energy in industrial production and transportation continues to increase. On the other hand, energy supply faces numerous challenges. For example, the growth of U.S. shale oil production has encountered bottlenecks, and it is expected to peak within the next two years. Moreover, geopolitical factors have also had a significant impact on energy supply. The Russia-Ukraine conflict has restricted Russia's energy exports, further exacerbating the tension in the global energy market. These factors together complicate the supply-demand relationship in the oil market and intensify price fluctuations.

(3) Inflation Expectations and Energy Prices

The current global economy is facing high inflation pressures, and inflation expectations persist. In an inflationary environment, energy prices often rise because energy, as an important production material and living necessity, is affected by both cost-push and demand-pull factors. The rise in energy prices not only increases production costs for enterprises but also pushes up consumer goods prices, further exacerbating inflation. Therefore, under inflation expectations, investing in energy assets such as oil serves a certain role in hedging against inflation risk.

(4) Geopolitical Risks

Geopolitical risk is one of the important factors affecting the oil market. The ongoing Russia-Ukraine conflict has not only impacted Russia's energy production and exports but has also had a widespread effect on the global energy supply chain. Additionally, the situation in the Middle East has been unstable, such as the turmoil in Syria and the tense relations between Iran and Israel. The oil production and exports from these regions may be affected by geopolitical risks, leading to increased uncertainty in oil supply, thereby driving up oil prices.

3. Buffett's Investment Strategy and Future Outlook

(1) Contrarian Investment and Long-Term Holding

Buffett has always advocated a contrarian investment strategy, buying when the market is sluggish and stocks are undervalued, and selling when the market is overheated and stocks are overvalued. His substantial purchase of Occidental Petroleum is precisely in a context where the market is generally bearish on the oil industry and Occidental Petroleum's stock price has significantly declined, reflecting his contrarian investment philosophy. At the same time, Buffett emphasizes long-term holding of stocks; he usually holds stocks for years or even decades. Regarding his investment in Occidental Petroleum, Buffett has also demonstrated a long-term holding attitude, stating in an interview: 'For Occidental Petroleum, we will buy as much as we can.' This indicates his optimism about the long-term development prospects of Occidental Petroleum and his willingness to hold its stock for the long term.

(2) Diversification of Investments and Hedging Risks

Although Buffett's investment in Occidental Petroleum is substantial, he still pays attention to diversification to reduce risk. In addition to Occidental Petroleum, Berkshire also holds stocks in other energy companies, such as Chevron. Moreover, Buffett's investment portfolio includes high-quality companies across various industries, such as Coca-Cola and American Express. By diversifying investments, Buffett can spread risks across different industries and assets, reducing the uncertainty brought by a single investment, thereby enhancing the overall stability and profitability of the investment portfolio.

(3) Future Investment Opportunities and Challenges

Looking ahead, the global economic situation remains fraught with uncertainty, but it also contains numerous investment opportunities. On one hand, as the global economy recovers and grows, energy demand will continue to rise, and the oil market is expected to welcome new development opportunities. On the other hand, the rapid development of the new energy industry also provides new directions for investment. Buffett may continue to focus on investment opportunities in the new energy sector, such as electric vehicles and renewable energy, to achieve diversification and sustainable development of his investment portfolio. However, the uncertainty of the global economy and market fluctuations also pose challenges for investments, and Buffett needs to continuously adjust and optimize his investment strategy to cope with the ever-changing market environment.

In summary, Buffett's substantial purchase of Occidental Petroleum is based on a comprehensive consideration of its investment value, global economic situation, and changes in the oil market. This move not only reflects Buffett's exceptional investment insight and rich experience but also provides important references and inspiration for investors. On the future investment road, Buffett will continue to create more value for investors with a robust investment strategy and keen market insight.