How will Manifold address share rounding making some bet sizes strictly worse than others?
2
280Ṁ3
resolved Jun 5
ResolvedN/A
94%Other
1.9%
This won't be fixed
1.9%
Automatically floor bet sizes to smallest with same profit
1.9%
Support for fractional shares & fractional M$
Because share amounts are rounded, some bet sizes are inefficient. E.g. for a yes/no market currently at 90%, $9 buys 9 YES shares, $10 buys 11 YES shares, $11 buys 12 YES shares. In this case, $10 is the lowest reasonable bet amount, and you should never bet $11, since it risks strictly more than betting $10, but you still only profit $1 if correct. The current UX for this seems to be "manually try a bunch of integer bet sizes and find the lowest one with a given profit". I see two obvious solutions: either automatically support this "rounding bet size down" behavior (so I don't have to do it manually), or supporting fractional shares (and, correspondingly, fractional $) - but perhaps there are others!
Get
Ṁ1,000
to start trading!
Sort by:
The presupposition of this question is false. Manifold displays the floor of share and M$ numbers to users, but doesn't actually round anything. Full floating point precision is there under the hood! I guess we could do a better job communicating this to users. Perhaps showing more digits in a tooltip?
@SG Oh, awesome! Purely for discoverability I think displaying some decimal points in a tooltip would be good, yeah. Particularly when floor(shares purchased) == M$ bet amount, but always displaying one decimal point would at least cue the user that full-precision floats are being used, if there was also a tooltip?

People are also trading

© Manifold Markets, Inc.•Terms•Privacy