Hansen and Singleton (1982) argue in a seminal paper that it is su cient to test the ® rst-order Euler equations implied by an economic model without having to solve for all endogenous variables. Many interesting economic models cannot be solved analytically, so restricting oneself to the class of solvable models would unnecessarily limit the scope of economic analysis. This paper argues that,...

Introduction: Venus host two distinctive terrains, one tectonic, the other volcanic. These two terrain types, ribbon tessera terrain and shield terrain are both extensively preserved across the surface of Venus, and they might also show a spatial correlation, which may, in turn reflect a genetic relationship. Geology: Ribbon tessera terrain (rtt) represents the oldest locally exposed unit acros...

Concern continues to be expressed about the rapid rise of health care costs in the United States, its present impact, implications for the future, and alternative policies aimed at moderating the increase. For example, a 1990 survey of 821 chief executive officers of businesses in Wisconsin revealed that 67 percent perceived health costs as "substantially out of control" with 96 percent respond...

An empirical study has been carried out to decide about the performance of various estimators used in unequal probability sampling without replacement and a sample of size 2. The Hansen–Hurwitz estimator and simple random sampling method has also been compared in this study. Some suggestions have been given at the end.