In the first cоuple оf lectures we discussed the pоwer of speciаlizаtion. We discussed how things аre assembled using a pencil as an example. We then want on to say that gains in productivity acted to both improve that product and reduce that cost. That, if you examined a general product over long periods of time, the tendency was for the product to become better and also to cost less. The example we spent time on and had a slide representing was of what product?