Comparative advantage has benefited American society in what way?
I ask because the one writer on Ricardos difficult idea seemed to spend a lot of time claiming that there were great advantages, yet those advantages weren't spelled out.
What are they?
The advantages of the principle of comparative advantage are:
- It give all participants in a given market something productive and profitable to produce/sell by dint of it incorporating the concept of opportunity cost
- Adhering to it contributes to creating more rather than less efficient allocations of resources
The benefits of comparative advantage (CA) are very well explained all over the WWW. Here is just one place:
Comparative Advantage, Economics by Topic | Library of Economics and Liberty .
Ordinary people avail themselves of CA everyday. For example, when I take my car to have the oil changed, I'm availing myself of CA. Changing car oil isn't something I'm incapable of doing, but it's something I'd rather not do and there are things I'd rather do instead of use my time to change the oil in my car, such as, perhaps review a presentation I'm going to deliver in a day or two, which is something for which I can bill for my time.
Since my hourly billing rate exceeds the hourly rate I must pay to have someone else change my oil, economics and the principle of comparative advantage says that I should pay them to change the oil while I review/edit/prepare my presentation. On the other hand, if I have nothing productive to do with the time during which my oil will be changed, I should change the oil myself.
Like nearly everything else about economics, comparative advantage does not function in isolation. Comparative advantage, substitutes, and elasticity collaborate to inform me of whether even having nothing productive to do with the time, I may yet pay someone to change my oil. How does that happen? Well, let's take a look...
In the case of an oil change, the things in play -- what for the transaction in question I see as substitute "goods" -- for me are (1) money, (2) time, be it leisure time or productive time. If I determine that I value an hour of leisure time over the $100 I'll pay for an oil change, I'll pay the money and sit on my ass doing nothing or playing pool or reading a book, or doing whatever I consider a leisure activity.
Let's say for the sake of what's to follow, that I'm willing to pay up to $199 for an oil change. Now if the cost of the oil change were $200, I would, because the limit of my elasticity of demand is $199 -- that is, I'm insensitive to the price unless and until the price reaches or exceeds $200 -- determine that I value $200 (in my pocket) more than I value an hour's worth of leisure time. In that case, in will either change the oil myself or find a lower cost oil changer.
The above is an illustration of what's good about comparative advantage. It's why someone can make a living changing oil even though people -- people like me who bill at rates higher than the cost of an oil change and people unlike me who bill at rates lower than the cost of an oil change -- even though people in general can probably change their oil themselves and pay less money to do so than were they to have their local car "fix-it" shop do so.
Did that adequately answer your question?
An important thing worth noting is that what the consumer deems as substitutes for any given transaction depends on the consumer. Economics doesn't articulate what items/services are substitutes; it predicts how folks will choose among the goods/services they see as substitutes.
In the preceding example, I said that time and money were my substitutes. Were I committed to letting someone else change my oil, the substitutes would then have been a Jiffy Lube oil change, an oil change I perform myself, a BMW store oil change, my neighborhood gas station's oil change. To the extent that they all can be had for $199 or less, with regard to me as the consumer, the providers of the oil change will observe perfectly inelastic demand, that is to say, they'll observe that I don't care what they charge, I'm willing and able to pay what they are asking. Which oil change I ultimately demand will depend on the value I place on the service they provide, the time it takes them to do the job, etc.
In considering the variation I just presented, I think you can see that multiple factors, along with the value -- weighting the demander sets on each factor -- play into the decision to demand this or that good/service. That's what I meant by saying that nothing in economics operates in isolation. Everything is in entry level econ classes taught in isolation, but tested in collaboration. In the "real world" it all works together and effectively at the same time rather than sequentially, although some things are somewhat sequential and some are without exception sequential.
FWIW, quantitative economics is the brand of the field that deals with identifying all the factors in play and putting them into equations that describe the supply and demand curves, from those that individuals and businesses face to those that nations and blocks of nations face. Fortunately for most of us, we have no need to know the precise equations for any given market, market participant or marketed good/service, etc. We need only know how the principles and law work, and that is why when you see supply and demand curves they rarely have actual numbers on the axes of the Cartesian quadrant -- upper right -- in which they are depicted.