Time Series Foundation Models in Finance: Useful Tool or Expensive Illusion?

Why general purpose forecasting models may help financial research, but only if they survive the clean out of sample validation.

Time series foundation models are becoming harder to ignore.

The basic promise is simple. Instead of training a forecasting model from scratch for every dataset, you use a model that has already learned patterns from a large collection of time series. The model is then applied to a new series with little or no extra training.

In plain English, it is the t…