Halving will not have any effect on price. There will be 3/4 of all coins in rotation already. It will only have effect on difficulty...
a maximum of 1800 coins will be dumped only per day in comparison with 3600 of today, which is 500k+ less to absorb, how is this not significant?
1800 coins per day out of 100's of thousands of coins traded per day is insignificant, but the inflation rate is reduced from 8% to 4%, and that should have a small long term effect -- perhaps 4%.
as i see it a reduction of 50%(from 8 to 4) is equal to an increase(of the price in the long term) of 100% so 4% is not right, unless you think that right now we have a 2% effect on the market....