Bulk buying

References

1. ^For a plain exponential (base $b$, rate $r$, and $k$ owned), Pecorella gives the most you can buy with $c$ currency as $\lfloor {\log }_r(c(r-1)/(b\cdot r^k)+1)\rfloor$.Dev blogPecorella 2016
   How we know

   $max = floor(log_r(\frac{c(r-1)}{b(r^k)}+1))$

   Checked against the evidence by its author, an AI model, 2026-10-20.

   In the claim ledger

2. ^ abThe drone panel prices 10, 100, and 1,000 drones as the exact sum of their single prices, and a purchase pays each drone's price in turn.CodeUniversal Paperclips main.js
   How we know

   p10h = p10h + Math.pow(h,2.25)*1000000;

   for (x=0; x<amount; x++){

   Checked against the evidence by its author, an AI model, 2026-10-21.

   Checked by a second AI model, 2026-10-21.

   In the claim ledger

3. ^ abbuy() charges each unit's rounded-up price in turn and ignores the shown total: 10 Grandmas from zero cost 2,035, not 2,031, and 2,030 cookies still buy 9.VerifiedCookie Clicker main.js v2.058
   How we know

   if (Game.cookies>=price)

   Game.ObjectsById[what].buy();

   Measured by a script. It fails if the result disagrees with the claim.

   The numbers come from the run; its author, an AI model, checked the script measures what the claim says, 2026-10-20.

   Checked by a second AI model, 2026-10-27.

   In the claim ledger

4. ^ abMax-buy (getMaxBought) counts the whole sets affordable but charges only the most expensive set × 10, about 0.1% under the sum at ×1,000 per set.VerifiedIvarK/AntimatterDimensionsSourceCode
   How we know

   NOTE! this assumes you only have to pay for the most expensive thing you get when you buy in bulk.

   331  dimension.currencyAmount = dimension.currencyAmount.minus(Decimal.pow10(maxBought.logPrice));
   

   Measured by a script. It fails if the result disagrees with the claim.

   The numbers come from the run; its author, an AI model, checked the script measures what the claim says, 2026-10-20.

   Checked by a second AI model, 2026-10-27.

   In the claim ledger

5. ^ ab“Buy until 10” charges price × purchases left in the set (costUntil10), exact since the price is flat within a set.CodeIvarK/AntimatterDimensionsSourceCode
   How we know

   389    return this.cost.times(this.remainingUntil10);
   

   Checked against the evidence by its author, an AI model, 2026-10-20.

   Checked by a second AI model, 2026-10-27.

   In the claim ledger

6. ^ abThe shown bulk price (getSumPrice) is the geometric sum $b\cdot r^a\cdot (r^k-1)/(r-1)$, discounted and rounded up once: 20.30× the next single price for 10, and 7.83 million× for 100.VerifiedCookie Clicker main.js v2.058 · Pecorella 2016 · Cookie Clicker Wiki, “Building”
   How we know

   price+=this.basePrice*Math.pow(Game.priceIncrease,Math.max(0,i-this.free));

   $cost = b * \frac{r^k(r^n-1)}{r-1}$

   \text {Price of Buy 10} = \text {Price} \times 20.303718238

   Measured by a script. It fails if the result disagrees with the claim.

   The numbers come from the run; its author, an AI model, checked the script measures what the claim says, 2026-10-20.

   Checked by a second AI model, 2026-10-27.

   In the claim ledger

7. ^Bulk options are 1, 10, and 100; “All” works only in sell mode and means 100 in buy mode.CodeCookie Clicker main.js v2.058
   How we know

   if (Game.buyMode==1 && Game.buyBulk==-1) Game.buyBulk=100;

   Checked against the evidence by its author, an AI model, 2026-10-20.

   Checked by a second AI model, 2026-10-27.

   In the claim ledger