Whenever Charlie and I buy common stocks for Berkshire's insurance companies (leaving aside arbitrage purchases, discussed later) we approach the transaction as if we were buying into a private business. We look at the economic prospects of the business, the people in charge of running it, and the price we must pay. We do not have in mind any time or price for sale.Indeed, we are willing to hold a stock indefinitely so long as we expect the business to increase in intrinsic value at a satisfactory rate. When investing, we view ourselves as business analysts - not as market analysts, not as macroeconomic analysts, and not even as security analysts.