The presidential race has reached the moment when the candidates are talking about issues. Donald Trump has put out a plan to restrict immigration. Jeb Bush gave a big foreign policy speech, as did Marco Rubio. The governor of Wisconsin, Scott Walker, will talk on August 18 about his plan to repeal and replace ObamaCare.

Hillary Clinton has tackled college costs and energy. On August 19, Mr. Bush and Mr. Walker are scheduled to appear in New Hampshire along with Chris Christie, Carly Fiorina, Bobby Jindal and John Kasich to talk about education.

The mysteriously missing topic? Monetary policy.

A critic of the Federal Reserve, Steve Lonegan of the group American Principles in Action, has organized a conference that will meet between August 27 ad August 28 at Jackson Hole, Wyoming, to coincide with the Fed’s own annual symposium there. Mr. Lonegan tells me that he invited all of the presidential candidates to attend and has so far found no takers.

“There’s something scaring them away,” he tells me. “The Republican candidates are sucking their thumbs…for some reason they are afraid to address it. I don’t understand it.”

The right-of-center think tanks that often serve as the source of campaign ideas are certainly willing to participate. Speakers at the Jackson Hole Summit include Stephen Moore and Jim DeMint of the Heritage Foundation, Jared Meyer of the Manhattan Institute for Policy Research, and Mark Calabria of the Cato Institute. Even the centrist, establishment Council on Foreign Relations is sending Benn Steil, author of “The Battle of Bretton Woods.”

Mr. Lonegan, who served 12 years as the elected mayor of Bogata, N.J., and was the New Jersey Republican Party’s candidate in 2013 for the U.S. Senate, says he understands that the presidential candidates have tight schedules and are focused on the early primary states. He is the New Jersey state chairman of Senator Cruz’s presidential campaign, and he notes that Mr. Cruz and Senator Paul have signed on as co-sponsors — they are the only two, at the moment — of Senator Cornyn’s Centennial Monetary Commission Act of 2015.

That bill would establish a commission to examine the United States monetary policy, evaluate alternative monetary regimes, and recommend a course for monetary policy going forward. But the candidates could be doing more, he says: “I’m trying to teach them, but so far I can’t say I’m making major headway.”

Mr. Lonegan says he’s all for cutting taxes and regulations. But there’s a third leg of the economic policy tripod, which is sound money, either a gold standard or a rule-based monetary policy.

Why aren’t the presidential candidates seizing the issue?

Mr. Lonegan talks about Paul Volcker’s Fed as part of the key to Ronald Reagan’s economic success. The double-digit inflation of the Carter years, though, was more obvious a problem than today’s dollar distortions, which have included rising prices for homes, art, and shares of stock.

If the villain of President Obama’s Fed was Ben Bernanke, Republicans must reckon with the fact that Mr. Benanke was appointed chairman by President George W. Bush. Mr. Lonegan allowed as how that might be a difficulty for Jeb Bush, but not necessarily for the other candidates.

Mr. Lonegan suggests that talking about the “failed policies of the Obama Fed” is a way for Republicans to respond to what Hillary Clinton and Bernard Sanders are saying about a widening income gap. The businessman who controls the Wall Street Journal and Fox News, Rupert Murdoch, and the former mayor of New York City, Michael Bloomberg, both recently sounded similar themes. Mr. Bloomberg asserted that the Fed’s low interest rates have “exacerbated the wealth gap between the poor and the rich because the rich have assets. And that is what is being hiked here because of low interest rates, whether they own stocks or real estate or whatever the case may be.” And Mr. Murdoch wrote on Twitter that “Fed trillions ended inflating existing assets. Stocks, real estate, art.”

A New York Times editorial puzzles over home prices and asserts, “only investment income has been rising steadily in the recovery, while wages from work have stagnated.” Much depends on whether the cost of employer-provided health insurance is included in wage income, but even so, and without mentioning the Fed, the Times editorialists sound a bit like Messrs. Bloomberg and Murdoch.

Maybe the presidential candidates think this is an issue too complicated for ordinary voters to understand? By that theory, voters are supposed to be fascinated by the details of H1-B visas, Iran’s nuclear centrifuges, elementary school student testing and teacher evaluation, hydraulic fracturing, and health insurance — but not at all interested in the value of a dollar. Could be. But in such a large field of candidates, you’d think there’d be at least one who would try talking about the issue at some length, if only to test the reaction. It might surprise.

Mr. Stoll is editor of FutureOfCapitalism.com.