Wholesalers built up their inventories in December in what likely reflects optimism for future sales. The build was roughly split between durable goods and nondurable goods, the latter subject to price swings for commodities. Inventories, which lagged sales in November, rose faster than sales in December to push up the wholesale stock-to-sales ratio by one tenth to 1.16. Inventories at the factory level, previously released, rose 1.1 percent in December. Inventory building is good news when the economy is on the rise as it points to job creation. Data on retail inventories will be posted with Tuesday's business inventories report.