What I'm about to write may seem obvious to most of us, but to many, I think, it's a concept neither easily grasped nor fully accepted.
Flying back last night, I was struck by the amazing efficiency of the market system. For a few hundred dollars, I was able to travel thousands of miles across the continent in mere hours, something that for tens of thousands of years of human history was simply unimaginable. It's amazing that, through combining my fare with that of the other passengers, we were able to pay our share of the plane's capital cost, fuel, and the salaries of the crew.
But it was the chicken salad that I was served that I found most interesting, as something most passengers would only think about in passing is the best example of the glory of the market. The cost of the salad as a percent of my ticket was insignificant, yet consider what went into producing the product. A wide range of farmers grew the food, and then shipped their product to plants where it was processed. It was then sold by distributors to Delta (or probably a group like SkyChefs), where more employees assembled the salads in plastic containers that have their own production path, starting with oil being turned into Ethylene. And yet all of this cost me no more than a buck or two.
The magic of the invisible hand.
More incredible is that along this entire production chain none of the items were produced by altruistic motivations (as in the communist ideal) nor was any production done at the point of a gun (as in real-life communism). Everyone along the path to my salad worked because they got something in return - an entirely selfish motivation - and yet the end result was a reasonably-tasty dinner that cost me the financial equivalent of maybe 10 minutes of work.
Capitalism - it's efficient and nutritious.
But this leap, it seems, is difficult for many to grasp. Capitalism's strength is in harnessing man's essentially selfish nature to produce a greater good for everyone in society. Yet accepting this requires a leap of logic that, while common-sensical to most, proves difficult for people who are unwilling to acknowledge the usefulness of selfishness. Neither the lettuce farmer nor the plastic container manufacturer really had to care about my enjoyment between Dallas and San Francisco, yet in order to keep supply contracts with Delta (or whoever their direct customers are), they are incentivized to provide a certain level of quality.
The left, largely unwilling to accept this essentially negative portrayal of the human spirit, is thus unable to make this logical leap which explains their fascination with alternative economic models from socialism to communism, models that are dependant on a certain level of altruism to work. Yet as we've seen time and time again throughout history, once this communal spirit breaks down, governments must force labor to keep production chains operational. Capitalism provides incentives far superior to a gun to keep our factories working.