What is the most expensive tornado?

Could you elaborate on the concept of the "most expensive tornado"? Tornadoes are natural disasters that can cause immense destruction and financial loss, but they don't typically have a monetary value attached to them in the same way that goods or services do. Are you referring to the total cost of damage caused by a particular tornado, or perhaps the cost of insurance claims filed after one? And if so, how do we determine which tornado is the "most expensive" when there are so many factors at play, such as the severity of the storm, the location it hits, and the time of year?