For the week ended Friday, August 28, the spot price index for a pound of cannabis jumped more than $70 from $1,924 in the prior week to $2,045.
The futures price for December 2015 remained unchanged at $1,385, but the September forward rose 4% to $1,925.
For the months of October through December, forward prices decline steadily.
About two-thirds of the past week’s transactions occurred in a range of $1,612 to $2,462 per pound, and transaction prices ranged from an average low of $1,100 in Washington state to a high of $3,400 in Midwestern black markets, according to the analysts at Cannabis Benchmarks.
The volume-weighted average price in Colorado jumped by 17% from $1,784 on August 14 to $2,085 a pound last week.