For PE discussion side, I would like to add on something. (which I had post once sometimes back)
Since inflation situation has worsen and economy high probably will slowdown significantly. Using PE to judge a stock, can be a trap as well. Some counters do trade at low PE like 8x or 10x, because market doesn't believe those company earning is going to be sustained as previously, aka market expect their earning going to drop in the future, that's why those share price reluctantly to go up.
Eg. as PER is using past year EPS to compute, let say a company's EPS last year is 10 cents, but its share trade at 1.00, so by right at PER 10x, it looks attractive and cheap but due to the fact economy slowdown will hurt the company future earning let say next year it only manages to earn 5 cents only. Then current price of 1.00 become a PER 20x already which become totally not attractive at all at the same price of 1.00
So this is why some counters being traded at low PER. Market doesn't necessary right on every stocks, so if company future earning does show good result which is not as same as market expected of going down. Then share price will react to the positively to upside.
But a lot of times, market is efficient enough and most of the time get it correct (Not all, market does get it wrong sometimes), typically eg. would be financial stocks in US. Previously, all were trading at 6x or 7x only, (like Citigorup was at USD 40-50), which by right is very very cheap, but market get it right, even at 6x or 7x, they are still bloody expensive and look at where those financial stocks now. No PE at all (because making tonnes of losses). FYI Citigroup now is less than USD20.
So of purely look at PE alone, then one would buy at USD50, 40, 30. But won't buy at USD 20 because now has no PER already.

Just joking.
Don't get me wrong, PER still a good way to judge a stock which is one of the basic fundmantal of stock investing. Just to remind people of potential PE trap (because PE figure is backward looking), as overall picture especially future of company is the main consideration of the stock market (as stock market is forward looking).
So using data and figure with due diligence. Don't rely a single data for any judgement, look at overall picture to justify so that view is much wider and potential being more accurate.
Just my 2 cents.

Thank you for your lengthy explanations.
In today trend, investors do not just rely on historical PEs alone as mentioned by you, future PEs of next 3 years are more important.
But if oil price is going up and up, impact on future no doubt is great, big adjustment might have to be made.
Like the case of Malaysia, the sudden increase of petrol and diesel would have great impact on our markets.
of course beside PEs, other imp ratios such as gearings, ROE and eps are o be considered.