Semantic Currency could reduce the usage of money at times when people would rather not use money, enable greater benefit when people are unable to use money, and enrich monetary transactions where money is appropriate. Semantic Currency is just information, and thus is not restricted by scarcity so long as the informational medium is working.
There are two kinds of Semantic Currency. Lucid value, or LV, like money, flows opposite the direction of value. For example, Joe provides a service to Lauren, and Lauren creates a document to credit Joe for doing so. This credit is used by service providers like Joe to engage more people with their service. You could think of this as similar to the function of Yelp, if Yelp reviews were digitally signed and passed from hand to hand.
Gratitude routes, or GR, flows in the same direction as the direction of value. This document is created by the service provider to direct incoming help. Nick is downstream* of Lauren and notices that Joe is now upstream* of Lauren. Nick wants to strengthen his own support network and so looks for a way to help Joe. Nick teaches math, and is informed by Joe's GR that Joe will be helped if Nick teaches Joe's kids. While Joe's kids are not Joe, they also are not directly participating in the Semantic Currency network, but can benefit from it through use of GR.
Lucid value is the way to earn Semantic Currency. Gratitude Routes are the way to spend it. They are both merely information and can be (to use a fiat currency term that doesn't really apply) minted at will by every agent. The documents persist in the network indefinitely, and are copied freely.
* Downstream and upstream refer to the flow of value. Helping someone puts them downstream of you. It's good to have as many people downstream of you as possible because it puts you upstream of them, and also upstream of those who are downstream of them.