Which category of spend item would be most suitable to purchase through an e-auction?

Leverage items [low supply risk, high financial impact] are best suited for e-auctions. Buyers can use

competitive bidding to drive down prices when multiple suppliers exist.

By contrast:

Bottleneck items [low value, high supply risk] are not suited as choice is limited.

Strategic items require partnership and collaboration, not price-only competition.

Non-critical items don’t justify the effort of auctions.

[Ref: CIPS L5M6 Study Guide, p.97 – Kraljic Portfolio Matrix]