They do not just sit there and voluntarily pay more taxes.

He lived by his own words, voluntarily paying himself $20,000 a year.

At that time he voluntarily paid the money to Westminster.

It is not clear how many customers would voluntarily pay more for their power to gain access to a conservation program.

Other countries voluntarily pay more than their fair share.

He voluntarily paid 1,830 pounds of debts left by his predecessor.

The excess was held to be recoverable as not having been paid voluntarily.

But they would not pay voluntarily for insurance against the danger of aggression by Cambodia.

How much would citizens voluntarily pay to protect wildlife or prevent pollution?

Here are a few entry policies, and what the institutions estimate that visitors pay voluntarily.