A more important cause, though, is that many investors prefer to operate informally to evade taxes.

A summary measure of the informal economy is the income generated by economic agents that operate informally.

Most gangs operate informally with leadership falling to whoever takes control; others have distinct leadership and are highly structured, much like a business or corporation.

From 1976 to 1985, the group operated informally, holding its first conference in 1977.

The registration process can be complicated and lengthy, but the government usually allows groups to operate informally while awaiting its response.

Prior to this date these courts operated informally without recognition as part of the legal system.

According to its website, the ferry operated informally from 1759 and in an organized way from 1799.

But this nascent Concert of Asia may best be left to operate informally.

Thirdly, we are talking about groups operating informally, but within an institutional process.

After operating informally for about a year, they decided to form the Caucus and contacted black congressmen in the United States to get guidance and assistance.