How much upside does Macquarie tip for Seek shares?

Seek Ltd (ASX: SEK) shares have outperformed the market for the year to date. 

At the time of writing, Seek has risen 4.6% this year, compared to 3.5% for the S&P/ASX 200 Index (ASX: XJO). 

It is one of three online classified businesses listed on the ASX, along…