I’ve been a Craigslist fan for years, using it for everything from snagging free goods to securing new jobs to buying baby strollers to selling baby strollers—you name it. Yet even as I’ve e somewhat of a Craigslist veteran, swapping this for that and that for this, each experience brings with it a new set of surprises and takeaways, particularly when es to the way I view trade and exchange.

Alas, in today’s giant global economy, it can be all too easy to feel like robotic worker bees or petty consumer fleas in a big, blurry economic order. We shouldn’t need reminders that daily tools like pencils and smartphones don’t just appear out of thin air, but based on the protectionist ethos that dominates our discussions on trade, it appears that we do.

In a way it’s understandable, what with all the conglomerates conglomerating and such. The bulk of Western society is no longer confined to bartering at the village market, nor are we bound to spend our days planting seeds and reaping harvests in a badda-bing badda-boom sort of way. Value creation, even at its largest margins, is increasingly difficult to spot.

And it is precisely here, I would argue, that bottom-up trading tools like Craigslist serve a bigger purpose than ridding our attics of stinky old mattresses. There’s something special about hum-drum personal exchange that reacquaints our economic imaginations with basic beauty of it all, cutting through and tearing down whatever pessimistic zero-sum mythologies we may be constructing.

From my own experiences, using Craigslist has reaffirmed the following key lessons. I’m confident many more will follow.

1. Value Is Subjective

I’ve long thought the success of certain high-end brandsis rather persuasive in proving this theory, but nothing quite tops seeing those same brands being given away for free on Craigslist.

For Billy, 1 orange is worth 10 apples. Yet months later, Billy puts that same orange out on the curb and lists it on Craigslist for free. Forwhatever reason, it’s no longer worth even trying to get someof thoseapples back. And behold, Sally eagerly awaits, ready to snag that orange from the curbside, because for her, it wasn’t worth 10 apples from the very beginning.

Value is a funny thing like that, and trade is a pretty handy tool for working things out in peaceful and productive ways.

2. Trade Empowers the Little Guy

Having recently moved into a new home, I’ve ramped up my Craigslist use significantly as of late. The needs persist, the wife insists, and the household budget cries for mercy. Thus, I’ve made somewhat of a sport out of finding various items well below the typical Cheapskate Index.To my delight, with enough patience and persistence, the little cash I’ve allotted to Furniture X or Yard Tool Y is often all someone cares to request (see lesson #1).

Having the opportunity to trade empowers me to find this rare match and, over time, inch my way above and beyond the perceived constraints of my situation. In many cases, this means I have mit other types of capital, such as time and energy spent painting or refinishing furniture, but these modities I have and others do not. If I survey my budget against the “normal” market price, it looks impossible, but when I use trade in innovative and entrepreneurial ways, those constraints often transform in rather spectacular ways.

Indeed, after searching Craigslist’s free section on a daily basis for the past several weeks, I can say with confidence that folks with no budget whatsoever could likely furnish an entire home for freeif they had patience and a basic willingness to part with certain aesthetics and functionality. Talk about a leg up for the poor.

3. Trust Matters

Economists routinely point to trust as a ponent of economic growth. In their marvelous book From Poverty to Prosperity, Arnold Kling and Nick Schulz refer to it as one of several “intangible assets” — unseen forces that propel humans toward increased innovation and collaboration.

This is evident at the Best Buy returns counter, of course, but with Craigslist, anything can happen. Indeed, for many a consumer, Craigslist is known by a series of well-publicized run-ins ranging from seedy to deadly. But on the whole, the fact that so many people use Craigslist without getting scammed or killed tells us something about humanity and the culture in which we live.

It’s hard to put my finger on it, but there’s something striking about buying a used lawnmower and having relative confidence that the seller isn’t out to burden me with his useless junk. I’ve long believed trust to be essential for economic flourishing, but Craigslisting has made me wonder how much it’s fed from the other end. Trust breeds trade, but trade also has the potential to teach plenty of trust.

4. Trade Connects Unlikely Friends

Free traders frequently argue that trade fosters peace — that if America and China are swapping toys and technology, they’ll be less likely to lob bombs at one another. This is probably true, but as a headline for the movement, it sure puts a damper on the romanticism of it all. Trade does, after all, connectactual people, and that means there’s much more at play than petty self-interest.

One of my favorite Craigslist experiences involved buying out-of-production toys from Disney/Pixar’s Cars series. It wasn’t special because I got a particularly good deal (I did), or even because my son loved his birthday gift (he did). It was special because after the transaction I spent a good 30 minutes chatting with the seller, a burly, heavily tattooed 40-something biker decked out in leather.After following him into his basement (see #3), I beheld something quite remarkable: wall-to-wall glass cases, stuffed with moreCars memorabilia than I new existed. He was just as eager to talk about it as I was to listen.

Here, in the musty basement of plete stranger, our differences no longer mattered. Whatever divides existed —generational, cultural, religious, or otherwise— we had something mon. Our boys loved Lightning McQueen, and as dads, we shared a passion to join in the fun alongside them. Trade connected two people who would’ve been unlikely to connect otherwise, and we were both better for it, materially, socially, and so on.

Every time I hear that tired-but-true boilerplate about “peace through trade” with China, I still shout “amen,” but I prefer to think of peace through trade with my biker buddy, Fred.

(Today at The Atlantic, Micah Mattix speaks to this from a different menting on the way Craigslist and other such tools are changing the ways artists find their audiences.)

5. Exchange Is a Social Thing

Perhaps the one thing that ties all this together is the obvious but underappreciated notion that interaction and exchange is interaction and exchange. All of the bigger economic arguments about mutual material benefit and the way trade connects Person X with ProductYor Service Z are important pelling, but they represent neither the arc nor the end of the story.

In connecting us with different people from different places, and in producing value and fostering trust throughout the process, trade brings with it a heavy social dynamic. There is more to value than a dollar amount. There is more to exchange than passing this object into those hands. And there is more that persists after the fact than a strike for or against the household budget.

As Jordan Ballor recently wrote, we were “made to trade,”or,“made to give and receive.”This is bound up in the “social nature of human beings, created in God’s image, in relation to him and to one another.”

Craigslist is but one of many arenas where this is abundantly clear, and each time I buy a cheap gallon of milk in the self-checkout aisle at Walmart, I try my best not to forget it.