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Variation in cannabis potency and prices in a newly legal market: evidence from 30 million cannabis sales in Washington state.
Addiction. 2017 Dec; 112(12):2167-2177.A

Abstract

AIMS

To (1) assess trends and variation in the market share of product types and potency sold in a legal cannabis retail market and (2) estimate how potency and purchase quantity influence price variation for cannabis flower.

DESIGN

Secondary analysis of publicly available data from Washington State's cannabis traceability system spanning 7 July 2014 to 30 September 2016. Descriptive statistics and linear regressions assessed variation and trends in cannabis product variety and potency. Hedonic regressions estimated how purchase quantity and potency influence cannabis flower price variation.

SETTING

Washington State, USA.

PARTICIPANTS

(1) A total of 44 482 176 million cannabis purchases, including (2) 31 052 123 cannabis flower purchases after trimming price and quantity outliers.

MEASUREMENTS

Primary outcome measures were (1) monthly expenditures on cannabis, total delta-9-tetrahydrocannabinol (THC) concentration and cannabidiol (CBD) concentration by product type and (2) excise tax-inclusive price per gram of cannabis flower. Key covariates for the hedonic price regressions included quantity purchased, THC and CBD.

FINDINGS

Traditional cannabis flowers still account for the majority of spending (66.6%), but the market share of extracts for inhalation increased by 145.8% between October 2014 and September 2016, now comprising 21.2% of sales. The average THC-level for cannabis extracts is more than triple that for cannabis flowers (68.7% compared to 20.6%). For flower products, there is a statistically significant relationship between price per gram and both THC [coefficient = 0.012; 95% confidence interval (CI) = 0.011-0.013] and CBD (coefficient = 0.017; CI = 0.015-0.019). The estimated discount elasticity is -0.06 (CI = -0.07 to -0.05).

CONCLUSIONS

In the state of Washington, USA, the legal cannabis market is currently dominated by high-THC cannabis flower, and features growing expenditures on extracts. For cannabis flower, both THC and CBD are associated with higher per-gram prices, and there are small but significant quantity discounts.

Authors+Show Affiliations

RAND Corporation, Santa Monica, CA, USA.RAND Corporation, Santa Monica, CA, USA. Heinz College, Carnegie Mellon University, Pittsburgh, PA, USA.RAND Corporation, Santa Monica, CA, USA.RAND Corporation, Santa Monica, CA, USA.RAND Corporation, Santa Monica, CA, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28556310

Citation

Smart, Rosanna, et al. "Variation in Cannabis Potency and Prices in a Newly Legal Market: Evidence From 30 Million Cannabis Sales in Washington State." Addiction (Abingdon, England), vol. 112, no. 12, 2017, pp. 2167-2177.
Smart R, Caulkins JP, Kilmer B, et al. Variation in cannabis potency and prices in a newly legal market: evidence from 30 million cannabis sales in Washington state. Addiction. 2017;112(12):2167-2177.
Smart, R., Caulkins, J. P., Kilmer, B., Davenport, S., & Midgette, G. (2017). Variation in cannabis potency and prices in a newly legal market: evidence from 30 million cannabis sales in Washington state. Addiction (Abingdon, England), 112(12), 2167-2177. https://doi.org/10.1111/add.13886
Smart R, et al. Variation in Cannabis Potency and Prices in a Newly Legal Market: Evidence From 30 Million Cannabis Sales in Washington State. Addiction. 2017;112(12):2167-2177. PubMed PMID: 28556310.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Variation in cannabis potency and prices in a newly legal market: evidence from 30 million cannabis sales in Washington state. AU - Smart,Rosanna, AU - Caulkins,Jonathan P, AU - Kilmer,Beau, AU - Davenport,Steven, AU - Midgette,Greg, Y1 - 2017/07/04/ PY - 2017/02/06/received PY - 2017/03/17/revised PY - 2017/05/22/accepted PY - 2017/5/31/pubmed PY - 2018/7/17/medline PY - 2017/5/31/entrez KW - Cannabis KW - drug policy KW - hedonic models KW - legalization KW - potency KW - prices SP - 2167 EP - 2177 JF - Addiction (Abingdon, England) JO - Addiction VL - 112 IS - 12 N2 - AIMS: To (1) assess trends and variation in the market share of product types and potency sold in a legal cannabis retail market and (2) estimate how potency and purchase quantity influence price variation for cannabis flower. DESIGN: Secondary analysis of publicly available data from Washington State's cannabis traceability system spanning 7 July 2014 to 30 September 2016. Descriptive statistics and linear regressions assessed variation and trends in cannabis product variety and potency. Hedonic regressions estimated how purchase quantity and potency influence cannabis flower price variation. SETTING: Washington State, USA. PARTICIPANTS: (1) A total of 44 482 176 million cannabis purchases, including (2) 31 052 123 cannabis flower purchases after trimming price and quantity outliers. MEASUREMENTS: Primary outcome measures were (1) monthly expenditures on cannabis, total delta-9-tetrahydrocannabinol (THC) concentration and cannabidiol (CBD) concentration by product type and (2) excise tax-inclusive price per gram of cannabis flower. Key covariates for the hedonic price regressions included quantity purchased, THC and CBD. FINDINGS: Traditional cannabis flowers still account for the majority of spending (66.6%), but the market share of extracts for inhalation increased by 145.8% between October 2014 and September 2016, now comprising 21.2% of sales. The average THC-level for cannabis extracts is more than triple that for cannabis flowers (68.7% compared to 20.6%). For flower products, there is a statistically significant relationship between price per gram and both THC [coefficient = 0.012; 95% confidence interval (CI) = 0.011-0.013] and CBD (coefficient = 0.017; CI = 0.015-0.019). The estimated discount elasticity is -0.06 (CI = -0.07 to -0.05). CONCLUSIONS: In the state of Washington, USA, the legal cannabis market is currently dominated by high-THC cannabis flower, and features growing expenditures on extracts. For cannabis flower, both THC and CBD are associated with higher per-gram prices, and there are small but significant quantity discounts. SN - 1360-0443 UR - https://www.unboundmedicine.com/medline/citation/28556310/Variation_in_cannabis_potency_and_prices_in_a_newly_legal_market:_evidence_from_30_million_cannabis_sales_in_Washington_state_ DB - PRIME DP - Unbound Medicine ER -