Can somebody explain to me why longer processes tend to be more productive? Is it simply because, all things being equal, it is more costly due to interest payments than an equivalent shorter process, and if that longer process was selected, it must have been because it was foreseen to be particularly profitable and therefore productive?
Here are some thoughts on this matter. First, suppose Crusoe uses sticks to collect berries and replaces his stick once it wears out, a process which takes him 1 day. But then he finds a cache of sticks on a steep hill, such that to go there, grab a stick, and come back takes 1 hour. Unfortunately, climbing the hill is too much for Crusoe. So, we see that not all shorter processes are in use.
Second, isn’t it often possible to initiate a more productive and at the same time shorter process with the help of new technology? What if it’s the same process yet the costs of, say, labor have gone down (e.g., Crusoe gets healthier due to all the manual work he had to do and capable of climbing the hill readily)? Won’t it be more productive yet take the same amount of time?
Third, time is just one factor of production. Why not say that if a particular process has expensive labor, it will be undertaken only if it is sufficiently productive to offset the extra costs? What’s so special about time? Why do we not say: “more labor-costly processes tend to be more productive”? Or: “processes which use more and more expensive natural resources tend to be more productive”? Or don’t we?
Fourth, is the idea that you can do more work in more time, and therefore, given more time, a product further away from the final consumer good than any other can be advanced to that final stage?
Fifth, do we mean that in order to get a society more amply supplied with consumer goods it is generally necessary to lengthen the production structure? But, again, why?
Sixth, suppose process A takes 1 week to produce its consumer goods. Process B is just like A but is preceded by a 3 week diversion of digging ditches and filling them back up. Surely, B is less productive than A, and yet it is longer. What’s going on here?
Gene Callahan writes that “It is not always true that the only available method of increasing production is to adopt more roundabout methods. Perhaps a shorter route to some goal just has not been imagined yet. … But historically, the constant agitation of humans to improve their circumstances is such that most of the opportunities to increase productivity lie in the adoption of more roundabout processes. Humans are adept at spotting the direct route to a goal in the first place.” (Economics for Real People, 134) But I’m not sure that his brief explanation is all that helpful.