Earning Per Share for the Index of Nifty is around 385;
Nifty is trading at 7800;
This gives us a PE of 20.25; Historically speaking, it is in the higher bracket. But it can go higher. It has touched 25 and 28 within the last decade.
Keeping the Earning constant, if PE were to touch 27, then Nifty will trade at 10385;
Therefore, Nifty touching 10K, as what the news-mongers are blaring, is not so insane a possibility
However, I have observed that in both those instances the PE went below 14 before scaling the 25 plus mark. This is just not a statistic, there is logic to it. Allow me to elaborate and present my theory.
Only when the prices become ridiculously cheap, this happens when PE goes below 14, that the dormant investors, who have parked serious money in Debt instruments or other such safe havens, change their stance. They see stocks as low risk, low enough to compare them with Debt, and shift money from Debt instruments to Equity. This huge influx of fund reduces the "floating shares" as they purchase for good. With the reduced number of shares being traded makes it possible for Nifty to touch insane levels of 25+ PE. It makes the kite light enough to fly.
To support my theory, I have also observed that when Nifty trades below the PE of 15, it is not a prolonged stay. Price spikes back up. The levels get rejected, price bounces off. This is a big event in nature because below 15, there is tremendous pessimism prevailing, equity is being sold in huge volumes; left, right and center. To absorb this pessimism and print a spike on the chart requires even more buying volume. Nothing short of it will do. It is almost the same above 24.