The effect of insecure ownership on ordinary investment and natural resourc
e use is examined. insecure ownership is postulated to depend on the type o
f government regime in power and the prevalence of political violence or in
stability. The political determinants of economywide investment are estimat
ed from cross-country data, and the results are used to form an index of ow
nership security. When introduced into empirical models of natural resource
use, this index has a significant and quantitatively important effect on t
he use of forests and petroleum. Contrary to conventional wisdom, ownership
risk slows resource use in some circumstances. (JEL Q20, Q30, E22).