In its Basic Laws, Israel defines itself as a Jewish and democratic state, and the nation state of the Jewish people. The country is a liberal democracy with a parliamentary system, proportional representation, and universal suffrage. The prime minister is head of government and the Knesset is the legislature. With a population of over 9 million as of 2021, Israel is a developed country and an OECD member. It has the world's 31st-largest economy by nominal GDP, and is the most developed country currently in conflict. It has the highest standard of living in the Middle East, and ranks among the world's top countries by percentage of citizens with military training, percentage of citizens holding a tertiary education degree, research and development spending by GDP percentage, women's safety, life expectancy, innovativeness, and happiness.