kaldor did not claim that any of these quantities would be constant at "all" times; on the contrary, growth rates and income shares fluctuate strongly over the business cycle. instead, his claim was that these quantities tend to be constant when averaging the data over long periods of time. his broad generalizations, which were initially derived from u.s. and u.k. data, but were later found to be true for many other countries as well, came to be known as 'stylized facts'.