Stock To Flow
We just added a stock-to-flow graph in our SANGraphs. Here's the graph for ETH:
(Note that this was literally created 10 minutes ago - any weirdness in the graph might be due to buggy implementation)
When studying Bitcoin people have noticed that there is a linear relationship between the logarithm of the price and the stock-to-flow ratio.
The same seems to hold for Ethereum but the data is more noisy: