Diversifying vs concentrating
Eight different items is not eight different bets. If all eight are bought by the same players for the same activity, one patch note moves every one of them, and you were concentrated the whole time without noticing.
Flipping does not have the version of diversification that investing books describe, because you cannot hold two hundred positions. You have at most eight, and often four or five that are worth having. The question is what to do with a very small number of slots.
What spreading out actually protects against
Three specific hazards, and it is worth being clear which is which.
- A single item breaking. An update, a supply flood, or a fall the item never recovers from. Spreading across genuinely different items reduces this a lot.
- A single item going illiquid. You are right about the price and still cannot get out, because there are no buyers today. Spreading helps here too, and it is the more common of the two.
- Every slot freezing at once. The failure that hurts most, because it stops you trading at all. Eight stuck positions is not eight small problems, it is one total one.
What spreading does not protect against is a change to the whole economy: a gold sink, a large content release that pulls everyone into one activity, or a general price drift. Nothing in a flipping book is immune to that, and pretending otherwise is where people take on more risk than they think.
The four kinds of correlation
Same consumer
Saradomin brew(4), Prayer potion(4), Shark and Dragon bones are all bought by people doing high level combat content. A change that makes that content more or less popular moves the demand for all four in the same direction on the same day.
Same supply chain
Iron ore, Coal and the bars made from them sit on one production line. A change to smithing rates, or a wave of gathered supply, moves the inputs and the outputs together, sometimes in opposite directions but never independently.
Same tier of gear
Abyssal whip, Dragon claws and Bandos chestplate compete for the same slot in the same players' plans. A new weapon or armour set arriving above them pushes the whole tier down at once, and the fall is the kind that does not come back.
Same trigger date
The most easily missed one. Several unrelated items can all be exposed to one announced update on one Wednesday. They are uncorrelated in general and perfectly correlated for that week, which is exactly the week your gold is in them.
The test is a sentence, not a category. Write down the one event that would hurt each position most. If the same sentence appears more than twice in your list of eight, you have fewer positions than you think.
Two versions of the same 40M
Book A. Eight positions of 5M each, all combat consumables. A patch reduces how much of that content people run, and the basket drifts down 4%.
Exposure: 40M. Paper loss: 1.6M. Slots affected: 8 of 8.
Book B. Three combat consumables (15M), two skilling supplies (10M), two rune positions (8M), one gear position (7M).
Same patch, same 4% on the consumable part. Paper loss: 600,000. Slots affected: 3 of 8.
The loss is a third of the size, and the more important difference is that Book B still has five working slots to trade the aftermath with. Book A has none.
Note what the example does not claim. Book B is not more profitable in a normal week; if anything it is slightly less, because the third best rune flip earns less than the best one. Spreading out buys you continuity, not yield, and continuity is what compounding needs.
Sizing from the fall, not from the slot count
Dividing the bank into eight equal parts is tidy and wrong, because the items are not equally dangerous. A better rule works backwards from the damage you are willing to accept.
Pick the most you are prepared to lose on any single position, as a share of the bank. Five percent is a reasonable starting point. Then, for each item, estimate the worst realistic fall before you would get out, using its recent range rather than your imagination. Maximum position size is the first number divided by the second.
Bank 40M, maximum acceptable loss per position 5%, which is 2M.
A staple consumable that realistically falls 6% before you exit: maximum position 33M. The buy limit will stop you long before that rule does.
A gear item with a recent range spanning 20%: maximum position 10M, a quarter of the bank.
A thin item that can move 40%: maximum position 5M, and you should ask whether it belongs in a flipping book at all.
The rule produces sizes that look uneven and are correct. It also gives you a fast answer to the most common sizing question, which is whether to put the whole bank into the one flip that looks unusually good today.
Bank sizes where each approach fits
Under about 5M: concentrate
Split 5M across eight slots and each position is 625,000 gp. On a cheap high volume item that is a few thousand gp of profit per round, which is not worth the attention it costs. One or two full limits on items you understand will grow the bank faster, and buy limits are nowhere near binding at this size.
About 5M to 50M: spread, and mix the speeds
This is where four to eight positions genuinely pay. You can fill several limits, the slots are the constraint rather than the gold, and the fast and slow mix from lesson 1 applies directly.
About 50M to 250M: spread by necessity
Limits now bind. You cannot concentrate even if you want to, because no single cheap item will absorb the gold in one window. The work shifts to finding enough good positions, which is what the Margins board is for.
Above about 250M: concentration returns
The only items that can hold that much gold are the expensive ones, and there are not many of them trading with real volume. A book of 8 Dragon claws and a handful of similar positions is concentrated by construction, and the risk management has to move from spreading to sizing and patience.
The honest case for concentrating
Spreading is not automatically better, and two arguments for concentration are real.
The first is attention. You can know one item properly: its usual daily rhythm, how deep the buy side normally is, which hours it is thin, what its last three price shocks were caused by. That knowledge is worth more than a fifth position in something you have never watched, and it does not scale past a handful of items.
The second is that a small bank has to take some risk to grow at all. Diversification lowers variance in both directions, and a 3M bank spread across eight tiny positions is a very safe way to make almost nothing. Under the thresholds above, concentration is the correct choice.
How many positions is the right number
The count that matters is ideas, and three to four independent ideas is where the benefit of spreading has mostly arrived. Going from one idea to two removes the worst outcome entirely. Going from two to four smooths the week noticeably. Going from four to eight barely changes the risk and does change the quality, because the eighth idea is by definition your eighth best.
That is why a good book usually looks like three or four ideas held across six or seven slots, with the better ideas taking two slots each rather than being padded out with weaker ones. Duplicating a good idea across two items in the same group is not diversification, but it is a perfectly sensible way to get more gold into a position that the buy limit would otherwise cap.
There is a practical upper bound too. Each open position costs attention: a price to watch, a deadline to check, a thesis to re-read. Past about six live positions most people stop maintaining any of them properly, and an unmaintained position is the one that turns into the six week disaster from the last lesson. If adding a ninth idea would mean checking none of them, the ninth idea is a loss.
Auditing your own book
Once a week, list what you are holding and answer three questions.
- How many ideas is this? Group the positions by the event that would hurt them, not by the item name. Two or three groups across eight slots is healthy; one group is a single bet.
- What share is in the largest group? If any group is more than about half the bank, either it is a deliberate call you can defend, or it happened by drift.
- Could I exit all of it in a day? Add up the daily volume behind each position. If your holdings are a large share of what trades in a day, you are concentrated in the way that actually hurts, regardless of how many item names are on the list.
My Flips makes the first two easy because it shows what you are actually holding rather than what you meant to hold, and the item pages carry the daily volume you need for the third. The usual finding is that a book people describe as diversified is two ideas with six labels.
You can make the grouping permanent rather than redoing it every week. Positions sort into named portfolios, and each one carries its own deployed capital, open profit and banked results. Name them after the ideas rather than the item types, so a portfolio is called something like "combat consumables" or "the drop rate change", and the second question above answers itself: the largest portfolio's deployed figure is the share of the bank in your largest group. Drift becomes visible as a number climbing rather than as something you discover during an audit you nearly skipped.
For the third question, Compare is quicker than opening item pages one at a time, because it puts two of them side by side with their volumes in view together. That matters here specifically: the question is not whether each position is liquid, it is whether all of them are liquid at the same time, and that is a comparison rather than a lookup. If two positions you were counting as separate ideas both trade a few hundred times a day, they will also both be difficult to exit on the same bad afternoon.
Item pages used above
Live prices, volume and buy limits for the items in this lesson: Saradomin brew(4), Prayer potion(4), Shark, Dragon bones, Iron ore, Coal, Abyssal whip, Dragon claws and Bandos chestplate.
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