It's well-understand how low interest rates boost the economy in the medium- and long-term. Companies deploy cheap capital to build new factories, and consumers buy more appliances, cars, and houses.

What short term behavior changes do emergency rate cuts cause to boost the economy? Are there capital projects that can get started in weeks, that were previously shelved because the rates were 0.5% too high, but are now viable? What sort of projects would these be?