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Minimax

Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA PM Exams › Minimax

  • This topic has 8 replies, 2 voices, and was last updated 4 years ago by John Moffat.
Viewing 9 posts - 1 through 9 (of 9 total)
  • Author
    Posts
  • September 28, 2020 at 5:17 pm #586924
    Nikitagarwal
    Participant
    • Topics: 154
    • Replies: 147
    • ☆☆☆

    Hey Sir,
    I have the below question on the captioned subject.
    A company wishes to decide on a selling price for a new product. Weekly sales of each product will depend
    on the price charged and also on customers’ response to the new product. The following pay-off table has
    been prepared.
    Probability Price P1 Price P2 Price P3 Price P4
    $ $ $ $
    Price 5.00 5.50 6.00 6.50
    Unit contribution 3.00 3.50 4.00 4.50

    Weekly demand Units Units Units Units
    Best possible 0.3 10,000 9,000 8,000 7,000
    Most likely 0.5 8,000 7,500 7,000 6,000
    Worst possible 0.2 6,000 5,000 4,000 3,000
    If the choice of selling price is based on a maximin decision rule, which price would be selected?
    My ques – They have applied minimax rule and to do so they have calculated weekly “contribution” and that is why they have cal demand*contribution ? So I wanted to understand why havent they used probability for that ? though I calculated the answer remains the same but wanted to understand the logic behind cal contribution instead of multiplying it by probability

    September 29, 2020 at 8:38 am #586962
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 54702
    • ☆☆☆☆☆

    We only multiply by the probabilities if we are using the expected value criteria.

    I cannot understand whether you are asking about maximin or about minimax regret, because you mention both.

    Have you watched my lectures explaining the different rules, and the logic behind them?

    September 29, 2020 at 11:07 am #586978
    Nikitagarwal
    Participant
    • Topics: 154
    • Replies: 147
    • ☆☆☆

    yes sir I re watched it. I always first watch your lecture then only jump to questions .
    I get it why we use it.

    September 29, 2020 at 4:26 pm #587004
    Nikitagarwal
    Participant
    • Topics: 154
    • Replies: 147
    • ☆☆☆

    Hey Sir,
    there is another question from BPP Revision Kit which is valid till June 2020 :
    Page 51 question 133 :
    As the question asked about the Minimax regret decision criteria for price:
    The following contribution table has been produced showing the possible outcomes.
    Price $425 $500 $600
    Variable cost $170 255,000 240,900 180,600
    $210 215,000 211,700 163,800
    $260 165,000 175,200 142,800
    Why have they calculated the minimax regret decision as per variable cost like row wise and why not column wise because as per my understanding they are asking about the price only and not abt the cost then why going row wise ?

    September 29, 2020 at 5:52 pm #587015
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 54702
    • ☆☆☆☆☆

    I only have the current edition of the BPP Revision Kit, and question 133 is not on page 51 (and is nothing to do with minimax regret).

    If you type the first few words of the question then maybe I will be able to find it (because it likely is somewhere in the current edition ? )

    September 30, 2020 at 6:01 am #587033
    Nikitagarwal
    Participant
    • Topics: 154
    • Replies: 147
    • ☆☆☆

    Yes sir, the question starts as follows:
    BDU Co is a manufacturer of baby equipment and is planning to launch a revolutionary new style of sporty
    pushchair. The company has commissioned market research to establish possible demand for the pushchair and
    the following information has been obtained.
    If the price is set at $425, demand is expected to be 1,000 pushchairs; at $500 it will be 730 pushchairs and at
    $600 it will be 420 pushchairs. Variable costs are estimated at $170, $210 or $260.
    It has 5 parts in it and I have been meaning to ask the below ques –
    What price would be set if BDU were to use a minimax regret decision criterion?

    Also, is it fine if I am using the older version of BPP kit or shall I get the new one ?

    September 30, 2020 at 8:24 am #587043
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 54702
    • ☆☆☆☆☆

    For minimax regret, we look at each uncertain item in turn and calculate for each of our choices how much would be lost by not having made the best choice.

    I do suggest that you watch my free lectures on this again.

    September 30, 2020 at 10:02 am #587045
    Nikitagarwal
    Participant
    • Topics: 154
    • Replies: 147
    • ☆☆☆

    Yes I have recently watched it also but my question is that for calculating the regret table and asked in question also that we need to calculate the price and by going row wise we will calculating the regret table for VC instead of Prices ?

    September 30, 2020 at 4:32 pm #587062
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 54702
    • ☆☆☆☆☆

    We calculate the ‘regret’ there would be for having chosen the wrong action, for each of the uncertain items in turn. It doesn’t matter which you have as columns or which you have as rows – it can be either, which is why the examiner is checking that you understand as opposed to just having learned rules without understanding 🙂

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