In the 1980's, Was It Cheaper to Take a Bus or a Taxi from Jerusalem to Tel Aviv?

From the Israel Ministry of Foreign Affairs, David Rosenberg writes:

When inflation was raging into the triple digits in the first half of the 1980s, checking the CPI was a daily pre-occupation. A joke at the time asked whether it was cheaper to take a bus or a taxi from Jerusalem to Tel Aviv. The price in shekels was about the same, but the correct answer was the taxi. Why? Unlike the bus, you paid at the end of the one-hour trip (when the shekel would be worth less than at the start).