What does the fair price line in that graph represent?
Estimated daily USD transaction volume (in USD) divided by 200000, which is the scaling factor that empirically fits best.
This is somehow like saying that a coin is worth about 0.0005% the total amount of coins exchanged every day.
Why that magic number? I don't know. Something about a balance between hoarding and spending habits of people: habits that are probably going to change over time, thus invalidating this graph. But to me it still holds at present. Which means we are slowly and painfully going to see 400s, maybe even 300s before reversal.
On a personal note I can't be bothered with trading right now. The swings won't be fast and I am not a patient man. Leaving most of my net worth in fiat for months on a bitcoin exchange, waiting for the
bitcoin winter to end time to buy back lower, is more uncomfortable than having my coins sitting on my own cold storage.