An economic model of multi-level marketing.

This paper offers an economic model of the operation of multi-level marketing (MLM) firms in competitive and non-competitive markets. The model takes a recursive approach to analyse decision making at the distributor level in order to understand basic issues in the MLM market and firm structure. Specifically, it is shown that under reasonable assumptions MLM firms will have a limited structure.

Healthy cities and self-reported health: evidence from Israel.

The World Health Organization's Healthy Cities Network (HCN) enlists community stakeholders (residents, businesses, non-governmental organizations and municipal governments) to promote health, quality of life and sustainable development in urban settings. The project, now three decades old, involves thousands of municipalities globally, including 52 in Israel. However, there is very little evidence regarding the effects of joining the HCN.

Particulate Matter Concentrations, Sandstorms and Respiratory Hospital Admissions in Israel.

Background: Exposure to air pollution in the form of particulate matter smaller than 10 μm in diameter (PM10) has been associated with increased morbidity and mortality. However, since air pollution is correlated with confounding factors that might otherwise affect health, identifying the causal link has proven challenging.

Objectives: To identify the effect of PM10 on hospital admissions due to respiratory illnesses.