Arena Blog
Data-driven insights on trading strategies, backtests, and market analysis.
1–2 of 2 posts
How Leveraged and Inverse ETFs Work — and Why They Decay
A 2x ETF promises double the index move — but only for a single day. The daily reset creates a decay that quietly grinds it down in choppy markets. How it works, who's on the other side, and why "×2 the index" is the most classic backtest mistake there is.
How ETFs Actually Work — and Who's on the Other Side
An ETF trades like a stock but is really a basket. Why does its price stay glued to the basket's value? An invisible arbitrage crew. How ETFs work, who's on the other side when you buy — and which counterparties (swap, securities lending) almost nobody sees.
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