Free hand
Every serious portfolio has a boring core: cash for emergencies, defensive assets for a lost income, a diversified engine that compounds for decades. Single stocks do not belong in any of those, because a single stock can go to zero and the core cannot afford to.
So professionals carve out a fourth place for them — the free hand. It is funded last, from whatever is left once the first three jobs are done, and it is deliberately the smallest layer. That order is the whole design: most people build it the other way round, put nearly everything into a handful of exciting positions, call it investing, and discover on a bad day that one bet was holding up their entire financial life.
The free hand is not a licence to be careless. It is the opposite — a fence around carelessness. Inside it you may chase an idea, hold a company because you believe in it, be completely wrong. Outside it, none of that is permitted. The question a professional asks before buying any single stock is therefore not “is this a good company” but “is this money in the free hand” — and if it is not, the answer is already no, whatever the company is.
Related terms: rebalancing keeps the layers at the sizes you chose; the investment policy statement is where the rule gets written down.
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