It is more that new rules are often introduced suddenly, leaving investors little time to modify their systems and strategies.

ECONOMIST: Hedge funds in Japan

The Memphis police have had plenty of time to modify the quota system, which was introduced in the early 1970s under pressure from the Justice Department in Washington, anxious to remedy past discrimination against black policemen.

ECONOMIST: Integration (2)

You can modify these settings at any time from the Privacy Settings page.

FORBES: Surprise! You Can Use Facebook For Caller ID.

To take advantage of this surge in shopping interest, most companies traditionally add to or modify their product offerings at this time of year.

FORBES: Why Less Is More for Holiday Shopping

"Surgery produced a one-time benefit but did not modify the subsequent natural history of the disease, " the doctors said.

BBC: Doctors back 'controversial' operation

This will happen when someone attempts to repeat, modify or debug a similar experiment and takes the time to examine all of the relevant raw data and decide for themselves how to interpret the experimental results.

FORBES: Would Your Blog Stand up To Criticism? Here Comes Peer Review

At that time, it became no longer possible to modify prices, metadata or other information.

ENGADGET: Microsoft putting Windows Mobile 6.x market out to pasture

Participation is subject to the terms of the Groupon Payments Merchant User Agreement, which may modify or discontinue the guarantee and the underlying services at any time.

ENGADGET: Groupon Payments comes to Android, starts catching up to Square

This time, Congress will probably accept the deal, but it is likely to oppose any later attempts to modify it.

FORBES: Magazine Article