Tech shares! Should we even invest in anything else?

Here's why I think all ASX investors should be looking to add ASX tech shares like Afterpay Ltd (ASX: APT) to their portfolios in 2020.

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Shouldn't we all just buy ASX tech shares from now on?

Tech shares of all stripes have done remarkably well since the S&P/ASX 200 Index (ASX: XJO) market bottom – but it's easy to forget just how well.

Since 23 March, the ASX 200 has risen approximately 28% (even after today's falls). But since the same date, the S&P/ASX All Technology Index (ASX: XTX) is up nearly 70%.

Just look at shares like Afterpay Ltd (ASX: APT). Its shares have been truly phenomenal to watch over the past 2 months. After bottoming out at $8.90 on 23 March, Afterpay shares were at an all-time high this week, hitting $54.85 at one point. That's a return of more than 500% – sensational stuff!

It's a similar story over in the United States for tech shares. Since 23 March (also the US market bottom), the Dow Jones Industrial Average has risen roughly 35%. But if you look at US tech shares like Apple (up nearly 50% since 23 March), Mastercard (up 43%), and Facebook (up nearly 52%), we can see a similar story playing out.

So should we just give up on the blue chips of the world in favour of ASX tech shares? By blue chips, I'm referring to the likes of Commonwealth Bank of Australia (ASX: CBA), Woolworths Group Ltd (ASX: WOW) and Telstra Corporation Ltd (ASX: TLS). 

A bull case for ASX tech shares

Well, I think to ignore tech shares is to do so at our own peril. These are the companies that are shaping the future of business in my view. Thus, I think it's imperative to at least consider some tech shares like Afterpay, or maybe Altium Limited (ASX: ALU) or NextDC Ltd (ASX: NXT) for one's portfolio. If you're aiming to build your wealth through ASX shares, you'll want to find at least some companies that are growing quickly – and there's nowhere better to find such companies than in the tech space, in my view.

If you're not confident investing in individual ASX tech shares, you can always look at exchange-traded funds (ETFs) instead. The Betashares Nasdaq 100 ETF (ASX: NDQ) is a great place to start. You can also have a look at the aptly tickered ETFS Morningstar Global Technology ETF (ASX: TECH).

In saying this, I also think it's a mistake to tar all ASX tech shares with the same brush. Like any other sector, there will be winners and losers. For every Afterpay, there's another tech company with a 'brilliant idea' that won't make it off the starter's block.

Furthermore, investors shouldn't forget that having a diversified portfolio is always important. And only investing in tech isn't diversified at all. The tech sector isn't immune from the vicissitudes of life and faces some unique risks that merit the same level of balanced diversification as any other sector in your portfolio.

Randi Zuckerberg, a former director of market development and spokeswoman for Facebook and sister to its CEO, Mark Zuckerberg, is a member of The Motley Fool's board of directors. Sebastian Bowen owns shares of Facebook, Mastercard, and Telstra Limited. The Motley Fool Australia's parent company Motley Fool Holdings Inc. owns shares of and recommends Facebook and Mastercard. The Motley Fool Australia's parent company Motley Fool Holdings Inc. owns shares of AFTERPAY T FPO, Altium, and ETFS Morningstar Global Technology ETF. The Motley Fool Australia owns shares of and has recommended BETANASDAQ ETF UNITS and Telstra Limited. The Motley Fool Australia owns shares of Woolworths Limited. The Motley Fool Australia has recommended Facebook and Mastercard. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

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