Monopoly witness, Dr. Lubin. Washington, D.C., Dec. 4. Dr. Isadore Lubin, Commissioner of the Bureau of Labor Statistics, appeared before the Monopoly Committee today. He said that a period of rising prices and 'painful economic readjustment' is in prospect as a result of the European war. 'The experience of the past 100 years, ' Lubin said, 'has demonstrated repeatedly that major wars bring tremendous changes in prices and have far reaching effect upon the structure of industry and upon the entire economy. Senator Borah presided in the absence of Senator O'Mahoney