Building a scenario, not a single number
A workable outlook usually sketches three paths rather than one: a base case built on the most likely continuation of current trends, an upside case if growth or earnings surprise positively, and a downside case if a known risk (a credit event, a policy mistake, a geopolitical shock) materializes. Each case gets a rough sense of what it would mean for stocks, bonds, and cash—not a precise price target, but a direction and a magnitude. Assigning even informal probabilities to each scenario forces a discipline that a single forecast does not: it makes clear the base case is a likelihood, not a certainty, and keeps the downside case visible instead of buried under optimism. Position sizing can then reflect that range—a portfolio built around one confident scenario is fragile in a way that a portfolio built around a distribution of outcomes is not.