# CPI PPI Data Could End October Roughly

> October's CPI and PPI data may trigger market volatility as earnings season approaches.
- Title: CPI PPI Data Could End October Roughly · Seekingalpha
- Summary: October's CPI and PPI data may trigger market volatility as earnings season approaches. Upcoming CPI and PPI data could cause market turbulence in October…
- Keywords: cpi, ppi, q3 earnings, interest rates, s&p 500, market volatility, money, business, Data, End, October, Roughly
- Source: Seekingalpha — https://seekingalpha.com/article/4953377-cpi-ppi-and-q3-earnings-soon-october-could-end-roughly
- Author: David H. Lerner
- Published: 2026-10-12T02:00:45+00:00
- Read time: 1 min
- Topics: cpi, ppi, q3 earnings, interest rates, s&p 500, market volatility, money, business
## Market Valuations Shift
The S&P 500's P/E ratio has sharply contracted from 30x to 19x due to rising interest rates.
## Upcoming Data Catalysts
Persistent high rates and volatility may pressure valuations further with CPI and PPI data as key short-term market catalysts.
## Tactical Market Approach
Analyst David H. Lerner remains hedged and tactically cautious, expecting a volatile week but seeing resilience in growth stocks if rates stabilize.
## Key takeaway

Upcoming CPI and PPI data could cause market turbulence in October amid rising interest rates and Q3 earnings growth.