Thompson Metal Corporation (TMC) supplies various types of machine tools to
manufacturing companies. TMC has always paid a lot of attention to the quality of its
products. Recently, an outside supplier has approached TMC to supply an important and
intricate component of one of its more advanced tools that TMC has been manufacturing
in-house. Sam Weiss, a junior accountant at TMC, has collected the following information
regarding this proposal.
The cost of manufacturing one unit of this component internally are as follows:
The outside supplier has quoted a price of $90 per unit for supplying this component. The
following is a conversation that took place among the manufacturing manager (Dana
Rice), the buyer (Emily Scanlon), and Sam Weiss.
Weiss: I think that we should continue to manufacture internally because we can save
$1.90 per unit on this component.
Rice: According to your report, we would save $1.90 per unit, but I do not agree with those
numbers.
Weiss: What do you mean? I have followed the same costing guidelines this company has
used for years. I have even cross-checked my numbers with historical data and know for
sure that the overhead rates which I have used are correct.
Rice: I am sure you have done your job thoroughly, but I think that our costing system is
archaic. This component is complex and difficult to manufacture. I believe that our
overhead allocation method does not accurately capture the production difficulties and
the additional resources that are devoted to the manufacture of this component. For
example, a significant portion of our quality problems are due to this component. We
spend close to a third of our quality inspection time on just this component alone, but that
is not reflected. These quality problems cause delays in getting this component to the