I've been looking at the Shiller PE Ratio [1] with raised eyebrows as much as the next guy, I'm just not seeing how discount brokerages specifically are at faul

I've been looking at the Shiller PE Ratio [1] with raised eyebrows as much as the next guy, I'm just not seeing how discount brokerages specifically are at fault. So far the S&P 500 has lost just one year of gains. I havn't done deep analysis but to me that still seems consistent with expectations that the economy will slow down for months due to sickness and lockdowns all over the world caused by the pandemic (+ this weekend's oil price thing). The PE ratio of the S&P 500 is still 20, so there is still some way down to go before I would call this the bubble busting .I don't have to hubris to predict how much more the market will fall tomorrow or in 3 months. [1] https://www.multpl.com/shiller-pe https://www.multpl.com/shiller-pe