This is another interpretation of the concept of "previous resistance becomes the next support" basically meaning that if the price ever retreats, it *tends to*, not always, to the highest point that the price has ever reached in the most recently, i.e, previous resistance point and usually is a good buying point because the price *supposedly* wouldn't drop any further. If you look at the chart, the first base is indicated by a big curved line representing the lowest point that the price has ever dropped to. And then the second base is supposed to be where the price will drop the second time and according to this theory, it's supposed to be to or on top of the previous resistance, where the price reached the highest last time. From this chart, it's supposed to be on top of the highest level that the price reached from the first base.
But what puzzles me is why is the second base is illustrated to be at $62 and not at $50? Since the first base, the price soared and then went back down to $50 before soaring again. So to me, that price drop to $50 should be the second base not when the price rose a second time and dropped back down again to $62. That $50 when the price dropped the second time is already around the resistance level from the first base and that should've been a good buying point because afterwards, the price really took off and even when it dropped back down, it was at a significantly higher level than both of the previous support levels and if you want to tp at this level, you would've netted a nice profit of ($62 - $50) = $12 per share. So wait until the price drops the third time and then set that to be the second base? That's giving up $12 for nothing. And what's even more strange is that the buying point isn't even set at the support level. It's set at the peak or the third resistance of $82??!! Why set the buying point so high at a resistance level? That is way too high of a buying level. It's not only giving up a profit of ($82 -$50) = $32 for nothing but is really at risk of buying at the peak and becoming fodder for people who are dumping the stock.
The chart looks like it's from a book and I dunno what concept the book is trying is illustrate exactly but to me, if the book is illustrating the concept of "previous resistance becomes the next support", this chart is not an efficient way of showing it.