Martin Zweig proposed the following rules for stock market buy and sell signals based upon the level and direction of interest rates in Winning on Wall Street.
Buy Signal: Any initial cut in the Prime Rate if the peak was less than 8 percent. Or, if the peak is 8 percent or greater, a buy signal comes on either the second of two cuts or a full 1 percent cut in the rate.
Sell Signal: Any initial hike in the Prime Rate if the low was 8 percent or greater. Or, if the low is less than 8 percent, a sell signal comes on either the second of two hikes or on a full 1 percent increase in the rate.
The table below documents the levels of the Prime Rate and the dates when the Prime Rate Indicator developed Buy or Sell Signals since 1947. Click here to read how The Prime Rate Indicator may have passed its prime.
| Signal | Date of Change | Prime Rate (%) |
| 12/16/2008 | 3.25 | |
| 10/29/2008 | 4 | |
| 10/8/2008 | 4.5 | |
| 4/30/2008 | 5 | |
| 3/18/2008 | 5.25 | |
| 1/30/2008 | 6 | |
| 1/22/2008 | 6.5 | |
| 12/11/2007 | 7.25 | |
| 10/31/2007 | 7.5 | |
| Buy | 9/18/2007 | 7.75 |
| 6/29/2006 | 8.25 | |
| 5/10/2006 | 8 | |
| 3/28/2006 | 7.75 | |
| 1/31/2006 | 7.5 | |
| 12/13/2005 | 7.25 | |
| 11/1/2005 | 7 | |
| 9/21/2005 | 6.75 | |
| 8/9/2005 | 6.5 | |
| 6/30/2005 | 6.25 | |
| 5/3/2005 | 6 | |
| 3/22/2005 | 5.75 | |
| 2/2/2005 | 5.5 | |
| 12/14/2004 | 5.25 | |
| 11/10/2004 | 5 | |
| 9/22/2004 | 4.75 | |
| Sell | 8/11/2004 | 4.5 |
| 7/1/2004 | 4.25 | |
| 6/27/2003 | 4 | |
| 11/7/2002 | 4.25 | |
| 12/12/2001 | 4.75 | |
| 11/7/2001 | 5 | |
| 10/3/2001 | 5.5 | |
| 9/18/2001 | 6 | |
| 8/22/2001 | 6.5 | |
| 6/28/2001 | 6.75 | |
| 5/16/2001 | 7 | |
| 4/19/2001 | 7.5 | |
| 3/21/2001 | 8 | |
| Buy | 2/1/2001 | 8.5 |
| 1/4/2001 | 9 | |
| 5/17/2000 | 9.5 | |
| 3/22/2000 | 9 | |
| 2/3/2000 | 8.75 | |
| 11/17/1999 | 8.5 | |
| Sell | 8/25/1999 | 8.25 |
| 7/1/1999 | 8 | |
| 11/18/1998 | 7.75 | |
| Buy | 10/16/1998 | 8 |
| 9/30/1998 | 8.25 | |
| Sell | 3/27/1997 | 8.5 |
| 1/31/1996 | 8.25 | |
| Buy | 12/20/1995 | 8.5 |
| 7/7/1995 | 8.75 | |
| 2/1/1995 | 9 | |
| 11/15/1994 | 8.5 | |
| 8/16/1994 | 7.75 | |
| 5/18/1994 | 7.25 | |
| Sell | 4/19/1994 | 6.75 |
| 3/24/1994 | 6.25 | |
| 7/2/1992 | 6 | |
| 12/23/1991 | 6.5 | |
| 11/6/1991 | 7.5 | |
| 9/13/1991 | 8 | |
| 5/1/1991 | 8.5 | |
| 2/4/1991 | 9 | |
| 1/2/1991 | 9.5 | |
| 1/8/1990 | 10 | |
| Buy | 7/31/1989 | 10.5 |
| 6/5/1989 | 11 | |
| 2/24/1989 | 11.5 | |
| 2/10/1989 | 11 | |
| 11/28/1988 | 10.5 | |
| 8/11/1988 | 10 | |
| 7/14/1988 | 9.5 | |
| Sell | 5/11/1988 | 9 |
| 2/2/1988 | 8.5 | |
| Buy | 11/5/1987 | 8.75 |
| 10/22/1987 | 9 | |
| 10/7/1987 | 9.25 | |
| 9/4/1987 | 8.75 | |
| 5/15/1987 | 8.25 | |
| Sell | 5/1/1987 | 8 |
| 4/1/1987 | 7.75 | |
| 8/26/1986 | 7.5 | |
| 7/11/1986 | 8 | |
| 4/21/1986 | 8.5 | |
| 3/7/1986 | 9 | |
| 6/18/1985 | 9.5 | |
| 5/20/1985 | 10 | |
| 1/15/1985 | 10.5 | |
| 12/19/1984 | 10.75 | |
| 11/28/1984 | 11.25 | |
| 11/8/1984 | 11.75 | |
| 10/24/1984 | 12 | |
| Buy | 10/16/1984 | 12.5 |
| 9/27/1984 | 12.75 | |
| 6/26/1984 | 13 | |
| 5/8/1984 | 12.5 | |
| 4/5/1984 | 12 | |
| 3/19/1984 | 11.5 | |
| Sell | 8/8/1983 | 11 |
| 2/21/1983 | 10.5 | |
| 1/11/1983 | 11 | |
| 11/22/1982 | 11.5 | |
| 10/13/1982 | 12 | |
| 10/7/1982 | 13 | |
| 9/3/1982 | 13.5 | |
| 8/18/1982 | 14 | |
| 8/16/1982 | 14.5 | |
| 8/2/1982 | 15 | |
| 7/29/1982 | 15.5 | |
| Buy | 7/20/1982 | 16 |
| 2/23/1982 | 16.5 | |
| 2/18/1982 | 17 | |
| Sell | 2/8/1982 | 16.5 |
| 12/3/1981 | 15.75 | |
| 11/24/1981 | 16 | |
| 11/16/1981 | 16.5 | |
| 11/9/1981 | 17 | |
| 11/3/1981 | 17.5 | |
| 10/13/1981 | 18 | |
| 10/5/1981 | 19 | |
| Buy | 9/15/1981 | 19.5 |
| 7/8/1981 | 20.5 | |
| 6/3/1981 | 20 | |
| 5/22/1981 | 20.5 | |
| 5/19/1981 | 20 | |
| 5/11/1981 | 19.5 | |
| 5/4/1981 | 19 | |
| 4/30/1981 | 18 | |
| Sell | 4/24/1981 | 17.5 |
| 4/2/1981 | 17 | |
| 3/17/1981 | 17.5 | |
| 3/10/1981 | 18 | |
| 2/23/1981 | 19 | |
| 2/3/1981 | 19.5 | |
| 1/9/1981 | 20 | |
| Buy | 1/2/1981 | 20.5 |
| 12/19/1980 | 21.5 | |
| 12/16/1980 | 21 | |
| 12/10/1980 | 20 | |
| 12/5/1980 | 19 | |
| 12/2/1980 | 18.5 | |
| 11/26/1980 | 17.75 | |
| 11/21/1980 | 17 | |
| 11/17/1980 | 16.25 | |
| 11/6/1980 | 15.5 | |
| 10/29/1980 | 14.5 | |
| 10/17/1980 | 14 | |
| 10/1/1980 | 13.5 | |
| 9/26/1980 | 13 | |
| 9/19/1980 | 12.5 | |
| 9/12/1980 | 12.25 | |
| 9/8/1980 | 12 | |
| 8/27/1980 | 11.5 | |
| Sell | 8/22/1980 | 11.25 |
| 7/25/1980 | 11 | |
| 7/7/1980 | 11.5 | |
| 6/17/1980 | 12 | |
| 6/13/1980 | 12.5 | |
| 6/6/1980 | 13 | |
| 5/30/1980 | 14 | |
| 5/23/1980 | 14.5 | |
| 5/16/1980 | 16.5 | |
| 5/7/1980 | 17.5 | |
| Buy | 5/1/1980 | 18.5 |
| 4/18/1980 | 19.5 | |
| 4/2/1980 | 20 | |
| 3/28/1980 | 19.5 | |
| 3/19/1980 | 19 | |
| 3/14/1980 | 18.5 | |
| 3/7/1980 | 17.75 | |
| 3/4/1980 | 17.25 | |
| 2/29/1980 | 16.75 | |
| 2/22/1980 | 16.5 | |
| 2/19/1980 | 15.75 | |
| 12/7/1979 | 15.25 | |
| 11/30/1979 | 15.5 | |
| 11/16/1979 | 14.75 | |
| 11/9/1979 | 15.5 | |
| 11/1/1979 | 15.25 | |
| 10/23/1979 | 15 | |
| 10/9/1979 | 14 | |
| 9/28/1979 | 13.5 | |
| 9/21/1979 | 13.25 | |
| 9/14/1979 | 13 | |
| 9/7/1979 | 12.75 | |
| 8/28/1979 | 12.25 | |
| 8/16/1979 | 12 | |
| 7/27/1979 | 11.75 | |
| 6/19/1979 | 11.5 | |
| 12/26/1978 | 11.75 | |
| 11/24/1978 | 11.5 | |
| 11/17/1978 | 11 | |
| 11/6/1978 | 10.75 | |
| 11/1/1978 | 10.5 | |
| 10/27/1978 | 10.25 | |
| 10/13/1978 | 10 | |
| 9/28/1978 | 9.75 | |
| 9/15/1978 | 9.5 | |
| 8/31/1978 | 9.25 | |
| 7/30/1978 | 9 | |
| 6/16/1978 | 8.75 | |
| 5/26/1978 | 8.5 | |
| 5/5/1978 | 8.25 | |
| 1/10/1978 | 8 | |
| 10/24/1977 | 7.75 | |
| 10/7/1977 | 7.5 | |
| 9/16/1977 | 7.25 | |
| 8/22/1977 | 7 | |
| Sell | 5/31/1977 | 6.75 |
| 5/13/1977 | 6.5 | |
| 11/24/1976 | 6.25 | |
| 11/1/1976 | 6.5 | |
| 9/24/1976 | 6.75 | |
| Buy | 8/3/1976 | 7 |
| Sell | 6/10/1976 | 7.25 |
| 6/1/1976 | 7 | |
| 1/21/1976 | 6.75 | |
| 1/12/1976 | 7 | |
| 12/2/1975 | 7.25 | |
| 11/7/1975 | 7.5 | |
| Buy | 10/28/1975 | 7.75 |
| 9/12/1975 | 8 | |
| 8/11/1975 | 7.75 | |
| Sell | 7/29/1975 | 7.5 |
| 7/20/1975 | 7.25 | |
| 6/9/1975 | 7 | |
| 5/20/1975 | 7.25 | |
| 3/24/1975 | 7.5 | |
| 3/18/1975 | 7.75 | |
| 3/10/1975 | 8 | |
| 3/5/1975 | 8.25 | |
| 2/24/1975 | 8.5 | |
| 2/18/1975 | 8.75 | |
| 2/10/1975 | 9 | |
| 2/3/1975 | 9.25 | |
| 1/28/1975 | 9.5 | |
| 1/20/1975 | 9.75 | |
| 1/15/1975 | 10 | |
| 1/9/1975 | 10.25 | |
| 11/25/1974 | 10.25 | |
| 11/13/1974 | 10.75 | |
| 11/6/1974 | 11 | |
| Buy | 10/22/1974 | 11.25 |
| 10/8/1974 | 11.75 | |
| 7/8/1974 | 12 | |
| 6/27/1974 | 11.75 | |
| 5/17/1974 | 11.5 | |
| 5/10/1974 | 11.25 | |
| 5/7/1974 | 11 | |
| 5/2/1974 | 10.75 | |
| 4/25/1974 | 10.5 | |
| 4/22/1974 | 10.25 | |
| 4/11/1974 | 10 | |
| 4/8/1974 | 9.75 | |
| 4/4/1974 | 9.5 | |
| 4/1/1974 | 9.25 | |
| Sell | 3/22/1974 | 9 |
| 2/25/1974 | 8.75 | |
| 2/19/1974 | 9 | |
| Buy | 2/11/1974 | 9.25 |
| 1/29/1974 | 9.5 | |
| Sell | 12/3/1973 | 9.75 |
| Buy | 10/29/1973 | 9.5 |
| 10/23/1973 | 9.75 | |
| 9/18/1973 | 10 | |
| 8/28/1973 | 9.75 | |
| 8/21/1973 | 9.5 | |
| 8/13/1973 | 9.25 | |
| 8/6/1973 | 9 | |
| 7/30/1973 | 8.75 | |
| 7/18/1973 | 8.5 | |
| 7/9/1973 | 8.25 | |
| 7/2/1973 | 8 | |
| 6/22/1973 | 7.75 | |
| 6/7/1973 | 7.5 | |
| 5/25/1973 | 7.25 | |
| 5/7/1973 | 7 | |
| 4/19/1973 | 6.75 | |
| 3/26/1973 | 6.5 | |
| 2/27/1973 | 6.25 | |
| 12/27/1972 | 6 | |
| 10/3/1972 | 5.75 | |
| 8/29/1972 | 5.5 | |
| 6/27/1972 | 5.25 | |
| Sell | 3/31/1972 | 5 |
| 3/20/1972 | 4.75 | |
| 2/16/1972 | 4.5 | |
| 1/18/1972 | 4.75 | |
| 1/3/1972 | 5 | |
| 12/17/1971 | 5.25 | |
| 11/8/1971 | 5.5 | |
| Buy | 10/20/1971 | 5.75 |
| Sell | 7/7/1971 | 6 |
| 4/23/1971 | 5.5 | |
| 3/19/1971 | 5.25 | |
| 3/11/1971 | 5.5 | |
| 2/16/1971 | 5.75 | |
| 1/18/1971 | 6 | |
| 1/15/1971 | 6.25 | |
| 1/6/1971 | 6.5 | |
| 12/22/1970 | 6.75 | |
| 11/23/1970 | 7 | |
| 11/12/1970 | 7.25 | |
| Buy | 9/21/1970 | 7.5 |
| 3/25/1970 | 8 | |
| 6/9/1969 | 8.5 | |
| 3/17/1969 | 7.5 | |
| 1/7/1969 | 7 | |
| Sell | 12/18/1968 | 6.75 |
| 12/2/1968 | 6.5 | |
| Buy | 9/25/1968 | 6.25 |
| Sell | 4/19/1968 | 6.5 |
| 11/20/1967 | 6 | |
| 3/27/1967 | 5.5 | |
| Buy | 1/26/1967 | 5.75 |
| 8/16/1966 | 6 | |
| 6/29/1966 | 5.75 | |
| Sell | 3/10/1966 | 5.5 |
| 12/6/1965 | 5 | |
| Buy | 8/23/1960 | 4.5 |
| 9/1/1959 | 5 | |
| Sell | 5/18/1959 | 4.5 |
| 9/11/1958 | 4 | |
| 4/21/1958 | 3.5 | |
| Buy | 1/22/1958 | 4 |
| 8/6/1957 | 4.5 | |
| 8/21/1956 | 4 | |
| 4/13/1956 | 3.75 | |
| Sell | 10/14/1955 | 3.5 |
| 8/4/1955 | 3.25 | |
| Buy | 3/17/1954 | 3 |
| 4/27/1953 | 3.25 | |
| 12/19/1951 | 3 | |
| 10/17/1951 | 2.75 | |
| 1/8/1951 | 2.5 | |
| Sell | 9/22/1950 | 2.25 |
| 8/1/1948 | 2 | |
| 12/1/1947 | 1.75 |