The $70 billion All Weather strategy, one of two flagship portfolios managed by Bridgewater and the firm’s long-only product, utilizes risk parity strategies designed to make money if either stocks or bonds decline. However, as many hedge funds learned last month, such approaches do not always pan out when both fall simultaneously.   The All Weather strategy famously does not hedge market exposure, relying on varying asset combinations to protect against market turmoil. October is reportedly looking much better. The All Weather portfolio is up 3.7% for the month through the end of last week, according to Reuters data, which...