<p class="MsoNormal" style="text-align: justify; margin: 0in 0.5in 0pt;"><span style="font-size: 10pt;"><span style="font-family: Times New Roman;">This paper examines a relatively short-term market reaction to unexpected earnings in Australia and the United States (U.S.).<span style="mso-spacerun: yes;"> </span>Using data from 1987 to 1998, we test the existence of a short-term market reaction to the release of earnings in both countries. Because accounting standards, stock market characteristics and culture are similar in the two countries, we expect similar market responses to earnings releases.<span style="mso-spacerun: yes;"> </span>The results indicate that both the Australian and the U.S. markets react relatively quickly to earnings releases. We also examine the incremental explanatory power of analysts’ forecast errors over the change in earnings per share.<span style="mso-spacerun: yes;"> </span>Both the change in earnings per share and analysts’ forecast errors are expected to provide information to the market.<span style="mso-spacerun: yes;"> </span>The results from this hypothesis conform to expectations, as both pieces of information are associated with market returns in the two countries.<span style="mso-spacerun: yes;"> </span>Finally, we utilize t-tests to examine if the coefficients between Australia and the U.S. are different.<span style="mso-spacerun: yes;"> </span>If so, differences in accounting, stock markets, and/or culture alter how information is processed between the two countries.<span style="mso-spacerun: yes;"> </span>This hypothesis is not supported.<span style="mso-spacerun: yes;"> </span>In sum, the U.S. and Australian stock markets react similarly to the release of unexpected earnings.</span></span></p>