diff --git a/src/reports/products.jl b/src/reports/products.jl
index 75c8bc3..a1a7799 100644
--- a/src/reports/products.jl
+++ b/src/reports/products.jl
@@ -5,7 +5,7 @@
 using DataFrames
 using CSV
 
-function products_report(solution; marginal_costs = true)::DataFrame
+function products_report(solution; marginal_costs)::DataFrame
     df = DataFrame()
     df."product name" = String[]
     df."location name" = String[]
@@ -21,7 +21,11 @@ function products_report(solution; marginal_costs = true)::DataFrame
     for (prod_name, prod_dict) in solution["Products"]
         for (location_name, location_dict) in prod_dict
             for year = 1:T
-                marginal_cost = location_dict["Marginal cost (\$/tonne)"][year]
+                if marginal_costs
+                    marginal_cost = location_dict["Marginal cost (\$/tonne)"][year]
+                else
+                    marginal_cost = 0.0
+                end
                 latitude = round(location_dict["Latitude (deg)"], digits = 6)
                 longitude = round(location_dict["Longitude (deg)"], digits = 6)
                 amount = location_dict["Amount (tonne)"][year]
@@ -49,4 +53,4 @@ function products_report(solution; marginal_costs = true)::DataFrame
     return df
 end
 
-write_products_report(solution, filename) = CSV.write(filename, products_report(solution))
+write_products_report(solution, filename; marginal_costs = true) = CSV.write(filename, products_report(solution; marginal_costs))
diff --git a/src/reports/write.jl b/src/reports/write.jl
index 59d4481..898b8cf 100644
--- a/src/reports/write.jl
+++ b/src/reports/write.jl
@@ -13,8 +13,8 @@ function write(solution::AbstractDict, filename::AbstractString)
     end
 end
 
-function write_reports(solution::AbstractDict, basename::AbstractString)
-    RELOG.write_products_report(solution, "$(basename)_products.csv")
+function write_reports(solution::AbstractDict, basename::AbstractString; marginal_costs = true)
+    RELOG.write_products_report(solution, "$(basename)_products.csv"; marginal_costs)
     RELOG.write_plants_report(solution, "$(basename)_plants.csv")
     RELOG.write_plant_outputs_report(solution, "$(basename)_plant_outputs.csv")
     RELOG.write_plant_emissions_report(solution, "$(basename)_plant_emissions.csv")