How do you determine if a stock is cheap? How has value investing recently performed? What can we learn from Berkshire Hathaway's 3 “ secret buys”? Michelle Martin finds out in conversation with Christopher Tan, CEO of Providend.

<p>How do you determine if a stock is cheap? How has value investing recently performed? What can we learn from Berkshire Hathaway's 3 &ldquo; secret buys&rdquo;? Michelle Martin finds out in conversation with Christopher Tan, CEO of Providend.</p>