Yes it is a rule. What is very very subjective is how you use it. How you pull the fibonacci, how you make the trendline etc.
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
CUF CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch