Many of the most important stories develop for years before they get covered because no one makes an official announcement, there is no central point where events occur, and the facts are scattered, subtle, and sometimes buried. Gene Roberts, the legendary executive editor of The Philadelphia Inquirer, often said these are stories that “ooze.”

In a widely applauded three-part series last month, The New York Times took a long, deep look at an important story that has oozed for decades: state and local subsidies to businesses.

Reporter Louise Story wrote in the first installment that the Times “analyzed more than 150,000 awards and created a searchable database of incentive spending.” The paper pegged the annual cost to taxpayers of the programs it identified at more than $80 billion, though it added that “the cost of the awards is certainly far higher.”

The series drew immediate and profuse praise. Neal Peirce, a state government specialist whose column is syndicated by The Washington Post Writers Group, called the series “a landmark in U.S. investigative journalism.” A column by Anna Codrea-Rado here at CJR stated that by augmenting the articles with an online database, Story “presided over the perfect marriage of big data and public service journalism.” And Matt Purdy, investigations editor at the Times, told me via email that the paper had “heard from scholars at the Federal Reserve and universities like Duke and Stanford who are grateful for the resource and plan to use Louise’s data in their research.”

I was among those who were thrilled to see so much front-page real estate devoted to a topic I had written about in my 2007 book on corporate subsidies, Free Lunch.

The series, on a vital but under-covered public issue, deserves much of this acclaim. The package compellingly portrays the power imbalance between corporations and local governments in negotiations over incentives, as well as the uncertain, and often unmeasured, benefits of these subsidies to the states and communities that bestow them.

But within days of publication the series also began to draw measured criticism not from the companies it exposed for taking taxpayer money, but from several of its own sources as well as noted authorities on the subsidy issues. These critiques—which amount to worries that the Times may have simultaneously understated and overstated the scale, and misstated the nature, of subsidies to business—were joined to praise for the effort. But with the Times package drawing mention in local coverage of these issues around the country, it is worth taking a closer look back at the criticisms now, because the series will continue to influence work by other news organizations—especially as state legislatures convene for a new year and budget debates move to the top of the news agenda.

Should sales tax exemptions count?

Perhaps the single largest critique focused on the Times’s choice to include sales tax exemptions for businesses in its accounting of subsidies. That decision was not a minor one. As Story wrote in the first article of the series, sales tax relief accounts for “around $52 billion of the overall $80 billion in incentives.”

David Cay Johnston covers fiscal and budget matters for CJR’s United States Project. He is a reporter with 46 years of experience, including 13 at The New York Times; a columnist for Tax Analysts; teaches tax and regulatory law at Syracuse University Law School; and is president of Investigative Reporters & Editors (IRE). Follow him on Twitter @DavidCayJ.