For Indonesia’s new financial hub to become a global powerhouse rather than an ambitious policy fantasy, the nation must offer investors what matters most: unyielding legal certainty.

Indonesian minister Rosan Roeslani told the Nusa Dua Forum that the hub would uphold high standards and provide the ‘best incentives’ to investors.

Indonesia has for a long time sought to develop its financial sector and hopes to provide wealth management services to rival neighboring Singapore, where many rich Indonesian…