TOKYO — Japan's government released a mixed bag of economic indicators Friday that did little to inspire confidence in the country's fragile recovery.

The unemployment rate in July improved for the first time since January, but families made less money. Deflation persisted as consumer prices fell for the 17th straight month.

Household spending rose, but the upswing may falter once government incentives for purchases of goods such as energy-efficient household appliances expire later this year.

The latest numbers underscore growing uncertainty for Japan's export-driven economy as it faces a surging yen and slowing global growth. In the April-June quarter, Japan lost its place to China as the world's No. 2 economy after posting annualized growth of just 0.4 percent.

"In our view, concern looms large for consumption given a weak labor market and fading policy stimulus," said Goldman Sachs economist Chiwoong Lee said in a note to clients.

Prime Minister Naoto Kan told reporters that Japan will take "decisive action" when necessary against excessive foreign exchange volatility.

The remarks were his strongest so far on currencies and suggests a new sense of urgency as the 63-year-old faces his first challenge for power less than three months since taking office. Veteran powerbroker Ichiro Ozawa, who has been critical of Kan's performance, surprised the political world Thursday by announcing he would run against Kan for the Democratic Party presidency. If Ozawa topples Kan next month, he would become Japan's sixth prime minister in three years.

Kan's staff is working on new stimulus measures, and an outline will be decided Tuesday. Kan also said he will meet with Bank of Japan Gov. Masaaki Shirakawa next week. Growing political pressure is expected to prompt the central bank to ease monetary policy next month.

The nation's seasonally adjusted unemployment rate improved to 5.2 percent from 5.3 percent in June, according to the Ministry of Internal Affairs and Communications. The result marked the first decline since January.

The number of jobless fell 7.8 percent from a year earlier to 3.31 million, while the number of those with employment stayed flat at 62.71 million.

Meanwhile, the country's core consumer price index, which excludes fresh food, fell 1.1 percent from a year earlier. Lower prices may boost individual purchasing power, but deflation is generally bad for an economy. It plagued Japan during its "Lost Decade" in the 1990s, hampering growth by depressing company profits, sparking wage cuts and causing consumers to postpone purchases. It also can increase debt burdens.

The government's new high school tuition breaks weighed heavily on the CPI, dragging education costs down 13 percent. A strong yen also pushed down prices of imported goods.

Retailers in heated competition for customers have been dropping prices to take advantage of the yen, which hit a fresh 15-year high against the dollar earlier this week. Major supermarket chains Ito-Yokado, Daiei and Aeon launched sales this month on imported products such as American pork and Australian beef.

The preliminary core CPI for Tokyo — considered a barometer of broader price trends — fell 1.1 percent in August, pointing toward another nationwide drop this month.

Kyohei Morita, chief economist at Barclays Capital Japan, does not expect the CPI to return to positive territory until mid-2012.

In a separate report, the ministry said average monthly household spending rose a real 1.1 percent in July. Monthly household income fell 1 percent to 562,094 yen ($6,645).