Kaldor's Growth Facts

1. Output per worker (Y/L) and capital per worker (K/L) grow over time at relatively constant and positive rate.

2. The ratio between capital and output (K/Y) is relatively constant over time.

3. The real return to capital (r and r-δ) is relatively constant over time.

4. The capital share (rK/Y) and labor share (wL/Y) are roughly constant over time.

http://citeseer.ist.psu.edu/viewdoc/download?doi=10.1.1.201.7768&rep=rep1&type=pdf