TOKYO—Japan’s wholesale prices likely hit a 13-year high in September, buoyed by lofty commodity prices, while firms’ machinery orders are expected to have risen for the second straight month in August, a Reuters poll showed on Friday. The corporate goods price index (CGPI), which tracks the prices companies charge one another for their goods, likely rose 5.9 percent in September from a year ago, according to a poll of 17 economists. That would be its highest annual price gain since September 2008. The index grew 5.5 percent year-on-year in August. On a monthly basis, Japan’s wholesale prices likely grew 0.3 percent in September after being flat the previous month, the poll showed. “Commodity inflation will affect prices of petroleum products, chemical, steel, and other metals, which results in a higher growth” in wholesale inflation, said Shunpei Fujita, an economist at Mitsubishi UFJ Research and Consulting. “But as the growth in …