Buffett on Corporate Scale: Why Historical Growth Cannot Be Directly Extrapolated

In Berkshire's 2007 Annual Shareholder Letter, Buffett juxtaposes two questions: where does corporate value come from, and how much future information do past growth records actually provide? This letter is not a spreadsheet for extrapolating historical returns. Based on actual excerpts read from the "Yardsticks" section of the public letter, this introduction explains his methods for measuring businesses and interpreting scale constraints.

The first concept is distinguishing sources of value. The letter separately observes investment assets such as stocks, bonds, and cash, as well as earnings generated by non-insurance operating businesses. As Berkshire gradually allocated more capital to acquiring operating businesses, focusing solely on the growth of investment assets would miss the component of operating earnings. Asset stock and period earnings are not the same metric; one cannot simply add these two raw figures together for valuation.

The second concept is distinguishing historical measurement from future prediction. Buffett believes that historical tables help understand businesses and can serve as a reference for valuation; however, Berkshire's asset and earnings base had already become very large, making it impossible to replicate or even approach its past growth record. This was his judgment regarding Berkshire's scale at the time and should not be rewritten as a universal law stating that all mature enterprises will stagnate.

For example, assume a company's profit base grows from 1 billion yuan to 10 billion yuan. With the same 10% growth rate, the required incremental profit increases from 100 million yuan to 1 billion yuan. This is merely an arithmetic scenario, not financial data from any specific real-world company. When using this to interpret today's growth narratives, one should continue to ask: what demand, capital, and operational capabilities are needed for the incremental profit, and do the original conditions for growth still hold?