diff --git a/b2/Makefile b/b2/Makefile
index 0754d97..d578867 100644
--- a/b2/Makefile
+++ b/b2/Makefile
@@ -83,4 +83,4 @@ spotless:	clean
 # ----- Experiments -----------------------------------------------------------
 
 try:
-	$(VALGRIND) ./boom HIERARCHY -c CHAR
+	$(VALGRIND) ./boom HIERARCHY -c CHAR -i INV
diff --git a/b2/db.c b/b2/db.c
index e15717c..12e508c 100644
--- a/b2/db.c
+++ b/b2/db.c
@@ -168,6 +168,18 @@ void part_add_stock(struct part *part, struct stock *stock)
 }
 
 
+static void dump_stock(FILE *file, const struct stock *s)
+{
+	const struct price *p;
+
+	fprintf(file, "    %s  %d %d  %s %g",
+	    s->cat, s->avail, s->package, "???", s->add);
+	for (p = s->price; p; p = p->next)
+		fprintf(file,  " %d %g", p->qty, p->value);
+	fprintf(file, "\n");
+}
+
+
 void part_dump(FILE *file, const struct part *part)
 {
 	const struct param *p;
@@ -181,5 +193,6 @@ void part_dump(FILE *file, const struct part *part)
 		}
 		fprintf(file, "\n");
 	}
-	if (part->stock);
+	if (part->stock)
+		dump_stock(file, part->stock);
 }
diff --git a/b2/lang.y b/b2/lang.y
index 0c0f894..04b0bd9 100644
--- a/b2/lang.y
+++ b/b2/lang.y
@@ -378,9 +378,7 @@ characteristics:
 part:
 	WORD WORD params TOK_NL
 		{
-			$$ = part_lookup($1, $2);
-			if (!$$)
-				$$ = part_add($1, $2);
+			$$ = part_add($1, $2);
 			if ($$->param)
 				yyerror("parameters already defined");
 			$$->param = $3;
@@ -414,14 +412,15 @@ param:
 inventory:
 	| TOK_NL
 	| inventory_item inventory
+		{
+			part_dump(stderr, $1);
+		}
 	;
 
 inventory_item:
 	WORD WORD stock TOK_NL
 		{
-			$$ = part_lookup($1, $2);
-			if (!$$)
-				$$ = part_add($1, $2);
+			$$ = part_add($1, $2);
 			part_add_stock($$, $3);
 		}
 	;