This card suggests a cool concept for a design space of scaling tag punishment cards. Unfortunately, Market Forces is never the best option.
- If the runner has no tags: Predictive Planogram is usually played on zero tags and Best Defense can target 0-cost cards (most usefully a Progenitor hosting Hivemind, a Misdirection, No One Home, and Tapwrm).
- If they're on 1 tag: Exchange of Information is usually the most valuable option. For economic gain, a 1-tag Predictive Planogram (+$3 to Corp, +3 optional cards) is usually stronger than a 1-tag Market Forces ($3 to Corp, -$3 to Runner).
- If they're on 2+ tags: BOOM! is usually game-winning. In-faction, Exchange of Information and Psychographics are more likely to be game-winning than a 2-tag Market Forces.
In every scenario, there is a much better option than a 6 credit swing per tag.
As long as cards which can reliably win at 2 tags exist, it's hard to create a use-case for a scaling card like Market Forces unless it has some effect at 0 tags. I hope that we eventually get a tag-optional version of this card like "The Corp takes $2 from the runner, plus $2 for each tag". This has more utility at 0-1 tags than the current Market Forces and is less likely to instantly bankrupt a wealthy runner on many tags. If this new card had a cost of $1, it'd be similar in impact at 0-1 tags to Predictive Planogram, which is strong enough to play in a variety of situations without creating balance problems or gutting any runner archetypes.