Compare Two Approaches to Building an Emergency Fund

Everyone agrees you need an emergency fund. Nobody agrees on how to hold it. Cash loses to inflation; invested money is not always available when needed. This compares the two main approaches honestly: the ten-year opportunity cost, the specific failure modes for each, who each suits, and a plain recommendation for someone starting from nothing.

Compare two approaches to building an emergency fund: the standard advice (save three to six months of expenses in cash, then invest) versus the segmented approach (build a small cash buffer, invest the rest of the emergency fund, and plan to use a low-interest credit facility as the bridge if the cash buffer is insufficient). Cover: what each approach costs in opportunity terms over ten years, the specific scenarios where each approach fails, who each approach suits based on their actual financial situation and risk tolerance, and a plain recommendation for someone who has no emergency fund at all right now and is trying to decide where to start. Close with a note that this is financial education, not regulated advice.