Hi, I don’t quite understand the nature of a tick.
First, I read from several sources and it seems there are two definition:
- A tick happens when either bid or ask price or both vary of at least the minimum value (1 pip).
- A tick show the update in the prices after a trade happen.
If I combine both ideas then it would mean that a trade will always result in a change in either price, which I am not sure is true. Can someone verify if either idea is true.