My thinking (as a total amateur):
You have to have some way of calculating the value of what it is you're buying and selling.
Without that, you can't really tell if the price is "high" or "low".
If you have some metric for value, then you can decide the price is good, so you sell some. If momentum slows, maybe you sell it all. If you think it's under-priced, maybe you don't sell.
You have to have some way of calculating the value of what it is you're buying and selling.
Without that, you can't really tell if the price is "high" or "low".
If you have some metric for value, then you can decide the price is good, so you sell some. If momentum slows, maybe you sell it all. If you think it's under-priced, maybe you don't sell.