Yes I saw that video and did some research on it. Makes a lot of sense. Thanks for the explanation!!

In the video link below, I used an example to illustrate the benefits of log (aka: semi-log) scaling over linear (aka: arithmetic) scaling. The reason that I prefer log scaling, particularly in longer-term charts like daily & weekly charts, is that it will adjust the candlesticks on the chart to proportionally to the PERCENTAGE moves instead of PRICE moves.

There isn’t much of a difference on a chart without a big price differential between the highs & the lows on the chart but there is a huge difference on stocks that have made some big price swings. Think of it this way:

Without log scaling, a $1 gain or loss on a $10 stock is a 10% move while that same $1 gain or loss when the stock is trading at $100 is only a 1% move. On the linear scale, the candles will be the same size although the first move was 10X greater (in percentage terms) than the second. As such, log scaling will make that first candle 10x bigger than the second.

https://rightsideofthechart.com/closing-market-analysis-swing-trade-updates-10-17-19/