Caterpillar Inc (CAT.NYSE) is expected to lower its forecasts for 2013 revenue and profit when it announces earnings on Monday, after the machinery maker signaled falling demand for its products in the first quarter, The Wall Street Journal reported. The company said Friday that retail sales by dealers fell 11% year-on-year last quarter. Sales were particularly weak in Asia, where they plunged 24% largely due to weakness in the Chinese market. Caterpillar had previously forecast revenue of US$60-68 billion for 2013, with earnings of US$7-9 per share. The stock has dropped 9.6% from the start of the year.