The Effect Of The Bullwhip Effect On Your Model

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If there are multiple questions in a comment, please allow the candidate to respond before asking the next question.

(1) I know that a large lot size has been associated with increasing number of defective units. On page 1, you wrote: “production stages are characterized….”. What is your evidence that fast production increases the generation of defective items (scrap)?

(2) Your demand is deterministic and the bullwhip effect has no place in your thesis. The bullwhip effect has no effect on your model, why it was mentioned twice? What is its relevance in the thesis?

(3) You assumed a single raw material to produce a single product. This makes Table 2.1 not representative of the literature review. For example, Jaber and Goyal (2009)
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What makes your model unique in that regard?

(6) On page 43, you consider that p = d. This situation can never happen. So, why need to consider it? I also think that N0 can never reach infinity; there should be maximum and minimum values on M0 and N0. What are these values? The minimum value that either M0 or N0 can take is 1. Note that when h3 < h’1, then neither M0 nor N0 is valid. In that case, they are forced to 1. Do you agree?

(7) Transportation in Figure 3.4 and its fixed and variable costs are either factored into the total cost of the distribution centre or the finished product warehouse. That is, transportation is not a level in the supply chain. This makes the model three rather than four levels. If you disagree, then why transportation is important to consider in an MNC context?

(8) Also, you wrongly phrased your model as a single item that is produced from different types of raw material; actually you assumed one type of raw material to produce a finished product. This is why it was possible for you to find an optimal solution. Furthermore, you neither considered the capacity of a transport vehicle nor the number of vehicles available. Why not? These points must be made clear in the thesis.

(9) On page 31 you wrote: “Transferring raw materials from RMW to MUP in batches to the buffer area makes the raw material inventory dynamics different from the earlier works”, what do you mean by this statement, and why it is important? Please
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