I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. Image source: Getty Images Edward Sheldon, CFA | Monday, 16th March, 2020 I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. 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Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. Global stock markets have plummeted in recent weeks due to the economic uncertainty associated with the coronavirus. And one question I’ve been asked a lot is whether now is a good time to invest. Stock valuations are now considerably lower than they were a month ago. Understandably, many people are wondering if a major opportunity has presented itself.Personally, I do think that a fantastic investment opportunity is emerging for long-term investors, as I expect global stock markets to eventually recover from this setback. However, given that the coronavirus situation could potentially get worse before it gets better, a cautious approach to investing is warranted, in my view.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…Is it a good time to buy stocks?The first reason I believe that it could be a good time to invest is that valuations are now far lower than they have been in the recent past. In the space of just a month, equity indexes have fallen significantly.The FTSE 100 index, for example, has dropped from around 7,500 points to just 5,350 points – a fall of nearly 30%. What this means is that many stocks are now trading at very attractive valuations, and offering much higher dividend yields.If you’re a net buyer of stocks, as I am, that has to be a good thing. Think of it this way – would you rather pay full price for a product or receive a 30% discount?Fear is in the air Another reason I feel that it could be a good time to invest is that there is a high degree of fear in the air right now. Many investors are in panic mode – last week, the FTSE 100 had its worst day since 1987.In the past, investing during periods like this has generally been extremely rewarding in the long run. Just ask Warren Buffett, who says that the key to making big money from stocks is to “be greedy when others are fearful.”A cautious approach is sensibleOf course, it’s important to realise that stocks could get cheaper from here. If the coronavirus situation gets worse, which I think it probably will, stocks could continue to fall in the short term. So my advice, if you’re considering investing in stocks now, is to average-in to the market over time. In other words, drip-feed money into the market slowly. That way, if stocks do fall further, you’ll be able to take advantage of the lower share prices on offer.I also think it’s sensible to be selective about your investments. In my view, the best strategy is to focus on high-quality companies with strong balance sheets and avoid investing in sectors that are likely to be hit the hardest by the disruption (such as airlines).In the long run, stocks are likely to recover. They have always recovered from economic shocks in the past. Those who are brave enough to invest now, while uncertainty is high, should be rewarded. See all posts by Edward Sheldon, CFA Is now a good time to invest?