Glaeser and Lang (2024; GL) reviews the accounting literature on innovation, which has increased substantially in recent years. GL makes an important contribution to accounting research by bringing into the literature the implications of Romer's Nobel Prize winning endogenous growth theory and by explaining how accounting research addresses questions related to innovation. We contribute to accounting research by building on GL's foundation to suggest three main paths forward for future innovation research. First, focus on innovation's three defining attributes: novelty, nonrivalry, and partial excludability. Second, determine the needs of various users of information about a firm's innovation activities and how to meet those needs; we focus on the needs of investors. Third, address questions our discussion highlights as potentially important for future research on financial reporting and innovation, including the crucial question of an innovation's identifiability.

We provide the first evidence after Regulation G on firms’ non-GAAP EPS denominator choices and whether they are informative or opportunistic. From 2013 to 2019, 17 percent of annual non-GAAP EPS numbers use denominators different from that of GAAP diluted EPS, which makes denominator adjustments among the most prevalent individual types of non-GAAP adjustments. For firms reporting GAAP and non-GAAP profits or GAAP losses and non-GAAP profits, we provide evidence consistent with denominator adjustments increasing non-GAAP EPS informativeness. Our evidence also suggests that opportunism in denominator choices is concentrated in firms reporting GAAP losses and non-GAAP profits and failing to adjust the denominator. Such nonadjustment is inconsistent with SEC requirements to report non-GAAP EPS “on a diluted basis” because the EPS denominator for a GAAP loss excludes dilutive claims. Although the SEC largely overlooks such firms, they are more likely, on average, to report non-GAAP EPS that analysts consider inflated.