Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Where can I find a definition of psychological barriers with respect to marketable securities?
I think "Psychological Pricing" is a similar phenomenon to what you are looking for.  This is where retailers use certain numbers in prices because those prices are more appealing to consumers.  Since stocks - and in your case bitcoin - have prices, they too will be more or less appealing at different prices based on psychology alone.