Comparing countries and regions
Major indices differ in currency, sector weights, trading hours, calculation methods, and constituent size. The S&P 500, DAX, Nikkei 225, Hang Seng, and other benchmarks therefore should not be compared as if they represented identical portfolios.
Time zones and overnight movement
A market shown as unchanged may be closed while another region is actively trading. Futures, currencies, and depositary receipts may move outside the home exchange session, but they are not identical to the final cash-market price. Date and session status matter.
Currency effects
An international investor can experience a gain in the local index and a loss after currency conversion, or the reverse. Exchange rates, hedging costs, inflation, interest rates, and tax treatment can materially change a cross-border return.
Use several sources
Treat the dashboard as a starting point. Verify major moves with the relevant exchange, issuer disclosures, central-bank releases, and reliable reporting. Market commentary often assigns a neat cause after the fact; uncertainty should remain visible.