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Should you keep cookies in the bank?

bob_32_116bob_32_116 Member Posts: 770 ✭✭✭
edited April 2017 in General Discussion
I did some calculations and came up with an interesting, and perhaps surprising, result....

It's been stated quite a few times that it's best to keep a minimum cookie balance in the bank in order to get the benefit from Lucky Cookie. Conventional reasoning runs as follows:

- Lucky Cookie releases 15 minutes' worth of production in cookies, or 15% of cookies-at-bank, whichever is less.
- therefore to get the full benefit, the number of cookies in the bank must be at least equivalent to 100 minutes (6000 seconds) of production.

This seems to say that if you have less than this amount in the bank, even if you have enough to buy another building or upgrade, you should hold off buying it and leave the cookies in the bank. Is this the best strategy though? I have decided that it's not always the best.

By spending those cookies now, you are missing out on potential benefit of Lucky Cookie - but you are buying increased production from your building, and getting it now rather than later, so there is a trade-off.

Let's do the analysis:

Assume I have the optimum number of cookies in the bank to take advantage of LC. This number is 6000*P where P is the current production. If I get LC it will give me 900*P.

Instead of that I can use the 6000*P cookies to buy a building or upgrade. Let's assume the time cost of the next best buy is T. Then the increased production I can purchase is 6000P/T (This is the definition of "time cost").

I can get this increased production later anyway, but by getting it now I get the benefit for 6000 seconds longer than I otherwise would. Hence the number of extra cookies I get by buying now is (6000^2 * P)/T

The condition for leaving the cookies in the bank rather than spending them is therefore

900 * P > (6000^2 * P)/T
i.e. T > (6000^2)/900 = 40,000 seconds

Most people are probably more concerned with getting the most out of Cookie Frenzy/Lucky Cookie combination, which yields seven times as many cookies. How does this change things?

The maximum yield from CF/LC is now 7 * 900P

The optimum cookies-at-bank is also multiplied by 7, i.e. 7 * 6000P

this increases the critical value of T by 7, i.e.

T > (7*6000)^2/(7*900) = 280,000 seconds.

What does this mean? In the earlier stages of the run, you are better off buying that building or upgrade and not worrying about missing out on the benefit of Lucky Cookie. Later on, it's best to keep that minimum in the bank.

If you keep track of the time cost of each item you buy, you'll find that in the later stages of a run the time cost is typically well over the million second mark, and at that time it's definitely best to plan for CF/LC combinations.
Post edited by bob_32_116 on


  • JezDavisJezDavis Member Posts: 195 ✭✭
    Interesting. It's something I'd guessed through observation but thanks for the analysis. It all hinges upon active play of course, but from the above I think it's worth taking away the fact that, when preparing for a period of active play and performing the 'three clicks' (Elder Pledge, Christmas and Golden Switch), it's now apparent that you shouldn't immediately top-up your buildings with the cookies that the newly-burst wrinklers release, but instead keep these cookies in the bank to boost production from the Lucky Cookies for the remaining time that the Elder Pledge holds.
  • bob_32_116bob_32_116 Member Posts: 770 ✭✭✭
    edited April 2017
    ^^ When I have Golden Switch turned off and Elder Pledge invoked, which is normally for only half an hour at a time, sometimes one hour, I generally don't buy buildings at all, for that very reason.

    Of course if you are able to buy stuff while still leaving enough cookies in the bank, there's no harm in doing so. It's pretty easy to calculate how many cookies you should keep in the bank; just multiply current production by 42,000.
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