Cramer said that some companies just "get it right," and Charles River is one of those companies that can go a lot higher.
For the next installment of "Cramer's Playbook," Cramer dove deeper into his rules that all investors should have two portfolios, one for retirement and one for discretionary, and no portfolio should have fewer than five stocks or more than 10.
Cramer explained that in order for any portfolio to be diversified, it needs at least five stocks. But since each stock takes regular homework, investors need to avoid burning out by keeping fewer than 10 names.
But can investors have the same stocks in both portfolios? Absolutely. Cramer said for younger investors especially, these portfolios can be identical. For older investors, however, the retirement portfolio should begin taking on less risk.As an example, Cramer said that stocks like EOG Resources (EOG) and Johnson Controls (JCI) are fine for both portfolios, but he'd go with Salesforce.com (CRM) for a discretionary portfolio, while choosing the more conservative Google (GOOG) for retirement. Likewise in the health care industry, Gilead Sciences (GILD) would be fine for discretionary, while Johnson & Johnson (JNJ) is better suited for retirement.