“Trading opportunities are like buses; if you miss one, another will come along soon”

“Trading opportunites are like buses/streetcars/trains; if you miss one, another will come along soon” means that nothing is so special that there’s not another financial opportunity just like it, if you miss out on one. The “like buses, if you miss one another will come along” has also been said of dating men and women.
 
The saying has been used in the financial community since at least 1981. Financial suthor Jane Bryant Quinn wrote in 1997, “Stocks, it is said, are like buses. If you miss one, another one will be by in just a few minutes, and it will be going the same way.”
 
     
Google News Archive
17 April 1981, Milwaukee (WI) Journal, “Give us each a good shelter” by Dick West, pt. 1, pg. 9, col. 1:
Tax shelters are much like buses used to be. If you miss one, another will be along in 15 minutes.
 
Google Books
The Investor’s Information Sourcebook
By Matthew Lesko
New York, NY: Perennial Library
1988
Pg. 141:
“Stocks are like streetcars. If you miss one, another one will come along.” So says experienced financial analyst Mel Wright of Dean Witter.
   
Google Books
The Dividend Connection:
How dividends create value in the stock market
By Geraldine Weiss and Gregory Weiss
Chicago, IL: Dearborn Financial
1995
Pg. 139:
Stocks are like streetcars. If you miss one, there is always another one just ahead.
 
Google Books
Google Books (revised 2009 edition)
Making the Most of Your Money
By Jane Bryant Quinn
New York, NY: Simon & Schuster
1997
Pg. 654:
Stocks, it is said, are like buses. If you miss one, another one will be by in just a few minutes, and it will be going the same way.
 
Google Books
Creative Negotiating:
Proven techniques for getting what you want from any negotiation
By Stephen Kozicki
Holbrook, MA: Adams Media
1998
Pg. 125:
Second, those types of opportunities are like buses: if you miss one, another will come along before too long.
   
Google Books
DeMark on Day Trading Options:
Using options to cash in on the day trading phenomenon
By Thomas R. DeMark
Boston, MA: McGraw Hill
1999
Pg. III:
You’ve heard the expressions “you’re only as good as your last trade,” “trading opportunities are like city buses — if you miss one, another will appear shortly,” and the ever-quoted market nemesis “coulda, woulda, shoulda.”
 
Google Books
What Self-Made Millionaires Really Think, Know and Do:
A Straight-Talking Guide to Business Success and Personal Riches
By Richard Dobbins and Barrie O. Pettman
Chichester: Capstone
2006
Pg. 152:
Opportunities are like buses. You need not worry if you miss one opportunity, because another one will come along in about 20 minutes.
 
SmartMoney
Tradecraft by Jonathan Hoenig
Don’t Dump Stocks When the Honeymoon Is Over
Published July 2, 2007
(...)
In the final analysis, stocks are like buses. Even if you miss one, there’ll likely be another one coming along in no time at all.