The phrase "frequent call" is correct and usable in written English.
It is typically used to describe the frequency of a phone call made by one person to another, such as in the sentence: "My grandmother makes a frequent call to check in on me."
Similar to the idea behind IEX, the frequent call market slows down trading by introducing a delay.
At Birmingham University's Nightline, in the last academic year, loneliness was the most frequent call topic (out of 26 categories).
In such a "frequent call" market, everyone has until the next time the exchange clears, or matches orders, to respond to new information.
And matching at regular intervals provides a notable additional benefit: our study showed that frequent call markets offer a significant improvement in trading gains.
On the domestic front, Mr. Bush's most frequent call for sacrifice, woefully amplified by a Marriott-sponsored TV ad to which he lends his image, has been for Americans to take more vacations.
Instead, Mr. Bernanke focused on fiscal policy, reiterating his frequent call for fiscal measures that focus on long-term reductions in the federal debt, while avoiding short-term cuts or tax increases that might impede recovery.
Their articles and videos have also frequently included racist and homophobic content and frequent calls for violence.
The Major's frequent call-ins to morning radio programs may be entertaining, but his erratic, hobo-like opinions and dirty language could alarm budding astronauts.
"There are frequent calls about this".
It will also cater some services to people who make frequent calls to Mexico.
He supported her with checks and frequent calls and letters that she only sometimes answered.
