The experience of the European Union shows that countries find it almost imposible to arrive at common immigration rules, even when free movement of labour among their own citizens makes such rules essential.However, countries could make a number of reciprocal concessions, such as removing all controls on the movement of labour among countries with similar levels of income per head.
In addition, this pruning rule is essential in reducing the tree size and remains indispensable for handling large datasets.
Most other countries, however, said the rule was essential and unlikely to be challenged.
The ethanol industry argues that the proposed rule is essential for reducing reliance on imported oil.
In routine cases, the fundamental alteration inquiry may end with the question whether a rule is essential.
Christophe Tulou, who directs the District's Department of the Environment, said the rule is essential to cutting nitrogen oxide emissions that help form smog.
"The Volcker Rule is essential to protect taxpayers from banks' excessive financial risk-taking, conflicts of interest, and from the resulting billion-dollar bailouts.
Inquiry into the nature, purposes, and scope of a particular constitutional rule is essential to the task of deciding whether that rule should be made the law of the land.
Development of such a rule is essential before companies can build power plants that will capture and store their carbon dioxide to limit the buildup of global warming gases.
The army, which used to justify its repressive rule as essential to keeping the fissiparous country together, does not like that idea either.Of the desired changes, the one allowing Miss Suu Kyi to become president seemed in some ways the easiest.
"The market access rule is essential for protecting the markets, and Knight Capital's violation put both the firm and the markets at risk," Andrew J. Ceresney, co-director of the S.E.C.'s enforcement division, said on Wednesday.
