The S&P/ASX 200 Index (ASX: XJO) is home to many blue-chips.
Among the most popular are shares in Goodman Group (ASX: GMG), Sigma Healthcare Ltd (ASX: SIG), and Qantas Airways Ltd (ASX: QAN).
But are they buys now? Here's why I think they are.
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Goodman Group shares
Goodman's most valuable asset may no longer be the warehouse itself.
The industrial property company controls well-located sites with access to consumers, infrastructure, and large electricity connections. That last requirement has become especially important as artificial intelligence and cloud computing increase demand for data centres.
Land can be found, but securing enough power in a major city can take years. I think Goodman's work assembling both gives it an advantage that cannot be quickly copied.
The ASX 200 blue-chip share can also develop projects alongside capital partners, allowing it to earn management and development income while sharing the cost of new facilities.
Data centres now dominate its development pipeline, while logistics remains a valuable business serving retailers, manufacturers, and distributors.
The shares usually command a premium, and construction delays could create volatility. I still think Goodman is one of the strongest ways to invest in the physical infrastructure behind the digital economy.
Sigma Healthcare shares
Sigma has become a different business since combining with Chemist Warehouse.
The merged company brings together pharmacy retail brands, a large franchise network, and a national wholesale and distribution operation. I think that scale gives Sigma several ways to improve rather than relying only on opening more stores.
A larger group can negotiate across more products, spread technology and marketing costs over a wider network, and use its distribution infrastructure more efficiently. It can also develop private-label products and health services that deepen customer relationships.
Competition remains strong, and Sigma still needs to integrate the businesses smoothly while protecting the value proposition that made Chemist Warehouse successful.
Overall, I think the merger has created a healthcare platform with more potential than either company had alone.
Qantas Airways shares
Airlines are traditionally difficult investments. Fuel prices can change quickly, disruptions are expensive, and customers remember poor service. Qantas has all those risks, yet I think its collection of assets is difficult to recreate.
The group combines a leading domestic network, valuable airport slots, Qantas and Jetstar, a large loyalty program, and a recognised international brand.
The loyalty division particularly interests me because it keeps Qantas connected with customers even when they are not flying. Credit cards, retail partners, rewards, and frequent-flyer activity can produce earnings that are less directly tied to jet fuel.
Fleet renewal and Project Sunrise should also improve the customer experience and gradually replace older, less efficient aircraft.
I expect plenty of volatility, but I think Qantas has more resilience than a basic airline description suggests.
Foolish takeaway
When looking for ASX 200 blue-chip shares, I want advantages that have taken years to build and a credible reason for the business to become more valuable.
These three companies meet that test for me and are all worth owning for the long-term.
