Rambling on about transaction costs from the last post.
Transaction costs are all over the place. When I travel to talk with someone, the cost of the travel in terms of time and money is the transaction cost of the talk. I could use the phone to have a talk. That reduces the transaction cost of having the talk. Telephones are a lower cost substitute for transportation in this case. This is one way that information and communications technologies reduce transaction costs. It is cheaper to move electrons than to move molecules.