From a blog called Snarkmarket, sorting the 2010 web using economic principles:
There are two kinds of quantities in the world. Stock is a static value: money in the bank, or trees in the forest. Flow is a rate of change: fifteen dollars an hour, or three-thousand toothpicks a day. Easy. …
But I actually think stock and flow is the master metaphor for media today. Here’s what I mean:
Flow is the feed. It’s the posts and the tweets. It’s the stream of daily and sub-daily updates that remind people that you exist.
Stock is the durable stuff. It’s the content you produce that’s as interesting in two months (or two years) as it is today. It’s what people discover via search. It’s what spreads slowly but surely, building fans over time.
… And the real magic trick in 2010 is to put them both together. To keep the ball bouncing with your flow — to maintain that open channel of communication — while you work on some kick-ass stock in the background.