Deep Dive — Arbitrage Mechanics, a Regulatory Ceiling, and the Price Nobody Checks

ETFs Are Cheaper. Except When They're Not.

The "ETFs beat mutual funds on cost" rule is true — for a handful of large domestic index funds. It quietly stops being true almost everywhere else, especially for the international exposure driving most of today's retail interest. The mechanism that's supposed to keep an ETF's price honest has a specific, well-documented failure mode in India that almost nobody checks for before they buy.

0.02% Cheapest Nifty 50
ETF's expense ratio

20% Premium one illustrative
buyer overpaid, gone in 7wks

$1B RBI/SEBI's cap on
overseas ETF investment

Sep '26 When SEBI's ETF
price-band fix goes live

The Setup

The Price You Pay Isn't Always The Price It's Worth

Here's a scenario used to illustrate how India-listed international ETFs actually behave: an investor puts a lump sum into a popular India-listed Nasdaq 100 ETF in early April 2025 — no foreign bank account or LRS paperwork required, just a ticker bought like any other stock. Seven weeks later, the Nasdaq itself has barely moved. The investment is down roughly 20% anyway.

Not because the index fell. Because the price paid was roughly 20% above what the fund actually held that day. That gap didn't correct itself quickly — it bled away over the following weeks until, by late May, the same ETF was trading slightly below its own net asset value.

The Line This Whole Piece Is About

The index was fine. The entry price wasn't. This is the story that "ETF vs Mutual Fund" content in India almost never tells, because most of it is a lightly reworded version of a framework built for the US market — where this specific problem barely exists.